Could I be pregnant??

It was weird. So my boyfriend and I got dominos last night at midnight and I had 3 pieces instead of my usual 2. I went to bed feeling really nauseous but I thought I was just full. Then at 4am I woke up and made myself vomit and went back to sleep. I thought if I got the pizza out of me I'd feel better. I woke up this morning feeling fine. We had cinnamon rolls for breakfast and since then I've been SUPER nauseous. I've thrown up 3 times, 2 of them weren't legit (I made myself throw up to get the cinnamon rolls out of my stomach). I told my mom what was happening and she freaked me out by asking me if I'm pregant. I had my period last week. Someone help me out here.