PASSED OUT!

Hey mommies this morning I was on the bus and passed out ! I was on the phone and all of a sudden I felt really hot and dizzy. Next thing you know everything went black ! And I could barely hear. I heard my mom on the phone saying "hello" but I couldn't answer . I woke up still dizzy and realized I passed out because I was now laying across the seats. About 15mins later I felt better, just had a headache. It was the worst and scariest thing that has ever happened. I ate this morning but I didn't drink water. I read that its low blood pressure from the pregnancy. Has this happened to anyone else . (First time mom, 13 week pregnant)