pregnancy, maybe?

me and my boyfriend began having sex not too long ago, we haven't used protection the times we have done it. he said he might've came inside a little before pulling out once 1-2 weeks ago but i didn't feel anything inside. i threw up this morning and have had more headaches than usual, i started bleeding today and my period isn't due for another 2 weeks. i also started on birth control pills a little over a week ago but i've only taken 3 of the 7 i was supposed to because i kept forgetting. could those be pregnancy symptoms or maybe medication problems? i'm freaking out