I'm 16 and on the pill. Wednesday I had unprotected sex on the pill for the first time with my boyfriend, he didn't cum in me. I overslept that day through my alarm and took my pill 2 hours late. And on Friday I took it 4 hours late. The Saturday after that I wasn't feeling too good and threw up. Sunday we had unprotected sex twice again, again he didn't cum in me. I've been having headaches and I spent all of last night throwing up. And I was supposed to get my period this morning but nothing yet. Also it's my first month back on the pill. Could be period just be regulating or am I pregnant?