Sick or side effects from vaccine!!

Yesterday I had my appointment, I’m 30 weeks and there was possibly 60 pregnant people and their husbands in the waiting room with me. Half of them had masks on. However today I woke up, feeling like I got the flu!!! However I got my tdap vaccine, what are the chances this is a side effect and not the flu? What should I be looking out for. I’m so weak I can’t even leave bed