Getting a positive pregnancy test after months or even years of trying can bring an incredible sense of happiness. But for women with PMOS, it can also bring a new set of questions and concerns.
You may have spent months tracking your cycles, taking medications such as letrozole or metformin, and waiting for that positive test. Once pregnancy is confirmed, you may wonder: Which medications should I continue? Which ones should I stop? Do I need additional hormone tests? And which symptoms require immediate medical attention?
PMOS does not stop mattering once you conceive. However, this does not mean you should be anxious about your pregnancy. Instead, understanding what to expect during the early weeks can help you have informed conversations with your obstetrician and follow the right care plan.
This guide explains the key things to know about PMOS and early pregnancy, including medications, hormone monitoring, warning signs and first-trimester care.
Why Does PMOS Change the Early Pregnancy Picture?
PMOS pregnancies may carry higher risks in certain areas. This is not because something is wrong with you. Rather, the insulin resistance and hormonal patterns associated with PMOS can also influence how pregnancy establishes and progresses.
Some of the risks associated with PMOS include:
- Higher miscarriage risk: Population studies have found that early pregnancy loss rates may be higher in women with PMOS compared with those without it.
- Higher risk of gestational diabetes: Insulin resistance associated with PMOS can continue into pregnancy, increasing the risk of gestational diabetes.
- Higher risk of pregnancy-induced hypertension: The risk may also be elevated, particularly in women who conceive without fertility treatment.
It is important to remember that these are population-level risks and do not predict what will happen in your individual pregnancy.
For women with PMOS, closer monitoring can be helpful — but it should not become a reason for unnecessary anxiety.
PMOS and Pregnancy Medications: What Should You Continue or Stop?
One of the most common concerns after a positive pregnancy test is whether medications taken during fertility treatment should be continued.
The answer depends on the medication and your individual medical history.
Metformin
Metformin is one of the medications that can cause confusion during early pregnancy.
Older guidance often recommended stopping metformin as soon as pregnancy was confirmed. However, more recent evidence has made the discussion more nuanced.
The source evidence notes that a 2026 systematic review found that continuing metformin through the first trimester was associated with higher clinical pregnancy rates and a trend toward lower miscarriage risk compared with stopping it immediately after a positive pregnancy test.
At the same time, current international PMOS guidelines still officially recommend discontinuing metformin once pregnancy is confirmed, while first-trimester safety evidence continues to be evaluated.
Several studies have also found no increased risk of birth defects associated with first-trimester metformin exposure.
The important takeaway: Do not stop metformin on your own immediately after seeing a positive pregnancy test. The decision may depend on factors such as your miscarriage history, BMI and how you conceived.
Ideally, discuss your metformin plan with your obstetrician before conception or as soon as you receive a positive pregnancy test.
Letrozole or Clomiphene
Letrozole and clomiphene are ovulation-induction medications. They are not medications that are generally continued after pregnancy is confirmed.
Their purpose is to help trigger ovulation, so once pregnancy has been established, your doctor will advise you about stopping them.
Progesterone Support
Some women with PMOS may be prescribed progesterone during the first trimester, particularly when there is a relevant risk history.
Progesterone may be prescribed in vaginal or oral form. However, it is not automatically required for every PMOS pregnancy. Your doctor will determine whether it is appropriate for you based on your individual history.
Folic Acid and Prenatal Vitamins
Folic acid and prenatal vitamins are an important part of pregnancy care.
For women with PMOS and insulin resistance, the source recommends discussing whether a higher dose of folic acid may be appropriate, particularly when planning pregnancy.
Rather than assuming that the amount in a standard multivitamin is sufficient, confirm the appropriate dose with your doctor.
Thyroid Medication
PMOS and thyroid disorders, particularly hypothyroidism, can overlap.
If you already take levothyroxine, do not stop or change your dose on your own after becoming pregnant.
Thyroid hormone requirements can increase during early pregnancy, so your doctor may monitor your thyroid levels and adjust your medication when required.
What Should You Avoid Without Medical Guidance?
Once you are pregnant, avoid restarting or self-prescribing medications or supplements without discussing them with your doctor.
This includes:
- Inositol
- Spironolactone
- Hormonal acne treatments
- Hormonal treatments for excess hair growth
Spironolactone, in particular, is contraindicated during pregnancy because of its anti-androgen effects on a developing fetus.
Which Hormone and Blood Tests May Be Important in Early Pregnancy?
Not every number on a laboratory report needs to be monitored repeatedly. However, certain tests may be useful depending on your medical history and your doctor's assessment.
Beta-hCG
Beta-hCG is generally more useful when looked at as a trend rather than as a single number.
In early pregnancy, hCG levels typically rise rapidly. Your doctor may recommend repeat testing when clinically appropriate to assess how levels are changing over time.
A single hCG value does not always provide enough information on its own.
Progesterone
Progesterone may be particularly relevant if you have a history of miscarriage.
The source notes that low progesterone together with slow-rising hCG during the first nine weeks has been associated with a higher risk of miscarriage. This is one reason doctors may sometimes evaluate both rather than relying on either measurement alone.
TSH
TSH, or thyroid-stimulating hormone, may be checked before conception and again during pregnancy, particularly when there is a history or risk of thyroid dysfunction.
Undiagnosed thyroid problems can add to pregnancy-related risks, making appropriate monitoring important.
Fasting Glucose or HbA1c
Because insulin resistance can exist before pregnancy in women with PMOS, your doctor may consider checking fasting glucose or HbA1c early in pregnancy.
An early baseline can help determine whether you need earlier or more frequent monitoring for gestational diabetes rather than waiting only for the standard screening period.
You do not necessarily need to request every test yourself. The important thing is to understand why a particular test may or may not be included in your pregnancy care plan.
Early Pregnancy Warning Signs: When Should You Call Your Doctor?
Many early pregnancy symptoms, such as nausea and fatigue, are common and do not necessarily indicate a problem.
However, certain symptoms should not be ignored.
Contact your doctor promptly if you experience:
- Heavy bleeding, such as soaking through a pad in an hour or passing clots
- Severe or one-sided abdominal pain, which may require evaluation for an ectopic pregnancy
- Sudden, severe headache accompanied by visual changes or swelling
- Fever above 100.4°F (38°C) with pelvic pain
- Persistent vomiting that prevents you from keeping fluids down for more than 24 hours
- A sudden reduction in early pregnancy symptoms accompanied by bleeding or cramping
Some symptoms, such as mild spotting, nausea and fatigue, can occur during a normal early pregnancy. However, if you are concerned about any symptom, discuss it with your doctor rather than trying to interpret it on your own.
What Does a First-Trimester Care Plan for PMOS Look Like?
Your pregnancy care plan will depend on your medical history, but your doctor may consider:
1. Early Dating Scan
An early dating scan may be recommended around 6–8 weeks, or earlier when clinically indicated.
2. Baseline Blood Tests
Depending on your history, your doctor may assess thyroid function, fasting glucose and progesterone, particularly if you have previously experienced miscarriage.
3. A Clear Medication Plan
If you were taking metformin before pregnancy, discuss whether it should be continued or stopped and understand the reason behind the decision.
Having a clear plan can prevent confusion after a positive pregnancy test.
4. Progesterone Plan
Your doctor may discuss whether progesterone supplementation is appropriate during the first trimester based on your individual risk history.
5. Early Gestational Diabetes Discussion
Since insulin resistance may already be present with PMOS, discuss when you should undergo glucose testing and whether earlier or more frequent monitoring may be appropriate.
6. First-Trimester Screening
A follow-up scan around 11–13 weeks may form part of routine first-trimester screening and provides another opportunity for your care team to assess your pregnancy.
PMOS and Pregnancy: Monitoring, Not Fear
Having PMOS can mean that your pregnancy requires closer attention, but risk statistics should not be interpreted as a prediction of your individual outcome.
Every pregnancy is different, and population-level statistics cannot tell you exactly what will happen in your pregnancy.
The most useful step you can take after a positive pregnancy test is to have a clear conversation with your obstetrician about your medications, blood tests, scans and monitoring schedule.
Rather than making changes based on assumptions or information found online, work with your doctor to create a pregnancy care plan that is right for you.