Consider someone who is 22 weeks pregnant and standing in line at the pharmacy in early September. She sees the sign for flu shots and pauses. Her first thought is simple: “Should I wait until I ask my OB/GYN?” Her second thought comes faster: “Could this hurt the baby?”
At fall prenatal visits, we hear versions of those questions every year. Pregnancy can make each health decision feel bigger, especially when online advice points in ten different directions. We’re glad when patients ask. A quick conversation can replace a lot of second-guessing.
The CDC recommends a flu shot during any trimester of pregnancy. September and October are generally good months to get vaccinated, which is why this question comes up so often as fall begins. [1]
Why flu prevention matters during pregnancy
During pregnancy, your immune system, heart, and lungs work differently. Flu can lead to more serious illness, including illness that requires hospitalization. A flu shot also helps protect your baby after birth through antibodies passed during pregnancy. [1]
We don’t say that to make you anxious every time someone nearby sneezes. We say it because planning ahead feels a lot easier than trying to make decisions while you’re sick.
Can I get a flu shot in the first trimester?
Yes. CDC guidance says the influenza vaccine can be given during any trimester of pregnancy. [1] You don’t need to delay vaccination simply because you’re early in pregnancy. If you’ve had a severe reaction to a vaccine or have questions about a particular health condition, bring those up with your provider before you get the shot.
One detail matters: pregnant patients should get the flu shot, not the nasal spray flu vaccine. The nasal spray uses a live, weakened virus and isn’t recommended during pregnancy. [1]
What side effects might I notice?
Most people have mild, short-lived side effects after a flu shot. Your arm may feel sore. You may feel tired or achy, or run a low fever for a day or two. Those symptoms can be uncomfortable, but they don’t mean you caught the flu from the vaccine. [1]
If you’re unsure what over-the-counter medicine is appropriate for a fever, aches, or another symptom during pregnancy, call your OB/GYN before taking something new. Our medication safety in pregnancy guide can help you prepare questions for that conversation.
What if I already feel sick?
A flu shot helps prevent flu. It doesn’t treat an active illness. Call your healthcare provider if you’re pregnant and develop flu-like symptoms such as fever, chills, body aches, a cough, sore throat, or sudden fatigue. Your provider can guide you on next steps and whether treatment may be appropriate.
We’d rather hear from you early than have you spend a miserable weekend wondering whether you should call. Pregnancy deserves a little more caution when you’re ill.
Bring the question to your fall prenatal visit
You already have enough to think about during pregnancy. Add this to your next appointment list: “Where should I get my flu shot, and do I have any reason to wait?” We’re happy to talk through timing, allergies, and any concerns you’ve heard from friends or online.
A flu shot is one small step that can help protect you during pregnancy and help protect your baby in the first months after birth. Ask your Women’s Integrated Healthcare provider about flu vaccination at your next prenatal visit. We’re here to help you feel prepared, not pressured.
Clinical reference
[1] Centers for Disease Control and Prevention, “Flu Vaccine Safety and Pregnancy”
