did i eat raw or expired fish ?

i’m 37 weeks & 3 days pregnant, i went over to my fathers in laws house and they made fish with noodles but we all ate, my sister in law and brother were farting, my husband was constantly going to the bathroom, i was feeling okay, until i got home, i’ve been going to the bathroom none stop and last time i went i had diarrhea, sorry for the tmi , but it hurts so bad feels like i’m squeezing the baby when i have to poop, what do i do ? if i did eat raw or expired fish is it bad for baby ? what can i drink ?