I had sex with my boyfriend on 20th and 22nd of march(2012). We did not use condoms and he did ejaculate inside me. I forgot to take ny birth control on Friday Saturday and Sunday and I Also forgot on thurday the second time we had sex. My question is, could I possibly be pregnant? If I am when will I notice symptoms? Can I take a pregnancy test before my missed period? And I'm on the birth control called sprintec so how effective is this pill?

Yes it is possible.