Q&A: Vaccinations Okay During Pregnancy?

My last period was more than seven weeks ago. I've taken multiple tests, including a blood test and all have been negative. With my son, I did the same thing and couldn't get a positive test until I was 9 weeks. I have vaccinations for school that I am due for and need to know whether or not I should take them. What do you suggest? — Mrs.Mandy
Save article
ByAshley Roman, MD
OB-GYN
Updated
Apr 2018
Hero Image

Depending on which test you use, you may be able to tell if you are pregnant in as little as a week after ovulation. A blood test is the earliest test to show a positive result (7-11 days after ovulation), while some home pregnancy test kits can test positive at the time of your missed period (14 days after ovulation) in up to 95% of pregnant women. If your last period was more than seven weeks ago and all tests since then have been negative, then it is unlikely that you are pregnant. But, it is difficult to say for sure without knowing the length of your usual cycles (the number of days from the first day of one period to the first day of the next).

With this information, if you still think that you might be pregnant, you should ask specifically which vaccinations you need. Some vaccinations (e.g. the flu shot) are safe during all trimesters of pregnancy. In fact, it is recommended that all pregnant women and women who plan on being pregnant during flu season (October through May) receive the inactivated flu vaccination. Other vaccinations such as the rubella vaccination should not be given during pregnancy. The rubella vaccination is what we call a live attenuated vaccine, meaning it consists of live but weakened virus. If you receive this vaccination during pregnancy, it can theoretically cross the placenta and affect the fetus although there have been no reports of adverse fetal effect in women who were inadvertently vaccinated during the first trimester. For more information, visit the CDC’s website. It’s a great resource with information about vaccination during pregnancy.

Related Video
Save article

Study Shows Many Parents Still Don’t Trust Routine Childhood Vaccines

Nehal Aggarwal
Associate Editor
Published
06/29/2020

New Technique Makes Vaccines Safe in Warmer Temperatures, Study Finds

Nehal Aggarwal
Associate Editor
Published
06/09/2020

These Are the Best and Worst States for Vaccination Rates, Report Says

Nehal Aggarwal
Associate Editor
Published
01/17/2020

Measles Virus Completely Wipes Out Your Immune System, Studies Find

Nehal Aggarwal
Associate Editor
Published
11/05/2019

Facebook and Instagram Debut New Strategy to Combat Vaccine Myths

Laurie Ulster
Contributing Writer
Published
09/05/2019

How to Talk About Vaccines Without Starting a Fight

Stephanie Grassullo
Associate Editor
Published
06/11/2019

CDC: Measles Cases Have Now Hit a More Than 25-Year High

Stephanie Grassullo
Associate Editor
Published
05/31/2019

Report: These Places in the US Have the Highest Risk of a Measles Outbreak

Stephanie Grassullo
Associate Editor
Published
05/10/2019

Instagram Doubles Down Efforts to Stop the Spread of Misinformation on Vaccines

Stephanie Grassullo
Associate Editor
Published
05/09/2019

Q&A: Modified Immunization Schedule?

Dr. Cheryl Wu
Pediatrician

NYC Declares Public Health Emergency, Orders Mandatory Measles Vaccinations

Stephanie Grassullo
Associate Editor
Published
04/09/2019

Italy Will Now Ban Unvaccinated Kids From School

Stephanie Grassullo
Associate Editor
Published
03/13/2019

Massive New Study Once Again Proves No Link Between Vaccines and Autism

Stephanie Grassullo
Associate Editor
Published
03/05/2019

Social Media Sites Crack Down on Misinformation From Anti-Vax Ads

Stephanie Grassullo
Associate Editor
Published
02/25/2019
Article removed.