Vaccines Before Pregnancy: MMR, Varicella, and Tdap

Which vaccines do experts suggest before pregnancy?

Preconception care includes a review of your immunization record so recommended vaccines are up to date before you conceive 1Ref 1American College of Obstetricians and Gynecologists (2019).ACOG Committee Opinion No. 762: Prepregnancy Counseling.Prepregnancy counseling recommends reviewing immunization status before conception, giving live vaccines (MMR, varicella) before pregnancy rather than during, and confirming rubella immunity2Ref 2American College of Obstetricians and Gynecologists (2018).ACOG Committee Opinion No. 755: Well-Woman Visit.The well-woman visit includes review and updating of immunizations, including confirming immunity to rubella and varicella before pregnancy. The American College of Obstetricians and Gynecologists recommends confirming immunity to rubella and varicella (chickenpox), since both infections can seriously affect a developing baby.

A few vaccines cluster around this window: - MMR (measles, mumps, rubella) and varicella are live vaccines given before pregnancy, not during - Tdap is usually given during each pregnancy, in the third trimester (between about 27 and 36 weeks), to protect the newborn from whooping cough - Flu and COVID-19 are recommended at any point, including before and during pregnancy

You can also review whether you are due for immunizations during pregnancy at the same visit.

Why can't live vaccines be given during pregnancy?

Live vaccines such as MMR and varicella use a weakened form of the virus, so guidelines advise giving them before conception rather than during pregnancy 1Ref 1American College of Obstetricians and Gynecologists (2019).ACOG Committee Opinion No. 762: Prepregnancy Counseling.Prepregnancy counseling recommends reviewing immunization status before conception, giving live vaccines (MMR, varicella) before pregnancy rather than during, and confirming rubella immunity. As a precaution, clinicians suggest waiting about 1 month (at least 4 weeks) after a live vaccine before trying to conceive.

That short gap is usually the only scheduling wrinkle. Non-live vaccines, including flu, COVID-19, and Tdap, carry no such waiting period and can be given whenever they are due. If a gap turns up after conception, a live vaccine is simply deferred until after delivery. Sorting this out early keeps your folic acid before conception routine and vaccine timing on the same calendar, so nothing gets missed in the months before trying.

What does rubella immunity have to do with it?

Rubella (sometimes called German measles) is the main reason MMR sits at the center of preconception planning 1Ref 1American College of Obstetricians and Gynecologists (2019).ACOG Committee Opinion No. 762: Prepregnancy Counseling.Prepregnancy counseling recommends reviewing immunization status before conception, giving live vaccines (MMR, varicella) before pregnancy rather than during, and confirming rubella immunity. A rubella infection during early pregnancy can cause congenital rubella syndrome, a pattern of birth defects affecting the heart, eyes, and hearing, so confirming immunity beforehand matters.

Immunity is usually checked with a simple blood test — a rubella titer — at a preconception or well-woman visit 2Ref 2American College of Obstetricians and Gynecologists (2018).ACOG Committee Opinion No. 755: Well-Woman Visit.The well-woman visit includes review and updating of immunizations, including confirming immunity to rubella and varicella before pregnancy. Many adults are already protected, because MMR and varicella are routinely given in childhood and adolescence, so the review mostly catches the smaller number who were never vaccinated or whose immunity has faded. If you are behind, you can catch up on adult vaccines first, and anyone unsure of their history can ask whether they need a measles booster.

Where do Tdap and HPV fit in?

Tdap and HPV are two more vaccines worth reviewing before pregnancy, even though they follow different timelines 1Ref 1American College of Obstetricians and Gynecologists (2019).ACOG Committee Opinion No. 762: Prepregnancy Counseling.Prepregnancy counseling recommends reviewing immunization status before conception, giving live vaccines (MMR, varicella) before pregnancy rather than during, and confirming rubella immunity. Tdap is usually given during each pregnancy, in the third trimester, so protective antibodies against whooping cough pass to the baby — less a "before" step than something to confirm on your record.

The HPV vaccine works the other way around. Because it is not given during pregnancy, the months before trying are a natural window to finish the series if you are eligible. In trials, the vaccine prevented roughly 98% of the high-grade cervical changes caused by the HPV types it targets in people not already exposed 3Ref 3FUTURE II Study Group (2007).Quadrivalent vaccine against human papillomavirus to prevent high-grade cervical lesions.Randomized trial showing the quadrivalent HPV vaccine prevented high-grade cervical lesions caused by targeted HPV types in previously unexposed women. Adults can ask whether the HPV vaccine still makes sense for them before pregnancy.

When vaccine gaps before pregnancy need a clinician

A primary care clinician or OB can pull your immunization history, order a rubella (and often varicella) titer, and map out timing before you start trying 1Ref 1American College of Obstetricians and Gynecologists (2019).ACOG Committee Opinion No. 762: Prepregnancy Counseling.Prepregnancy counseling recommends reviewing immunization status before conception, giving live vaccines (MMR, varicella) before pregnancy rather than during, and confirming rubella immunity2Ref 2American College of Obstetricians and Gynecologists (2018).ACOG Committee Opinion No. 755: Well-Woman Visit.The well-woman visit includes review and updating of immunizations, including confirming immunity to rubella and varicella before pregnancy. Because live vaccines need a short lead time, the preconception visit is the practical moment to close any gaps — ideally a few months before you hope to conceive.

If your record is incomplete, or you are unsure which shots you have already had, that is a common and easily solved situation rather than a setback. Gale can help you gather your vaccine records and prepare questions for that visit.