Passing out?

Hey everyone, so today I was at the mall in the maternity store. I’m 16 weeks and 5 days pregnant. I was talking to the cashier and my mom and boyfriend were with me, when all of a sudden I got super clammy and my vision went black. I got super dizzy and I passed out for a few minutes on the spot. I woke up and couldn’t talk to answer my mom- and she said my eyes were in the back of my head.

I’ve been to the hospital in the past week for cramping, and my vitals were fine then. Does anyone have any idea as to why this might have happened to me? I didn’t go back to the hospital as they wanted to take me to the one that has terrible staff