I'm on BC and took antibiotics for all of last month, could it be from that or could I be pregnant? I'm still not bleeding as heavy as normal. I normally have really bad cramps and haven't had any, I've been sick in the mornings the past week. But I was switched from Ompeprazole to Prilosec in the past few weeks, could that be the reason for feeling nauseous in the morning? I'm soo worried and confused! Someone please answer soon!