please give a gal a hand RN

Okay so little back story, hope you don't mind me having a quick waffle! A few months ago, I went on the pill. Since then my periods have been regular, nothing dramatic, I went on if for cramp relief, not contraception. Anyway I had sex for the first time in January, but it was more of a (in want of a better phrase) in n out because it hurt a lot. Since then I tried it twice more, once was the same thing. But last week I had what I'm assuming is proper sex (I know I sound pathetic!!) and it was pretty decent. My only issue now is, that I've been on sugar pills for a week. I am stressed like CRAZY because I haven't got my period which usually comes on my 4th or so sugar pill. I used protection when we had sex, but now I'm remembering that I may have missed a couple of active pills leading up to it. I took all of them at least 4-5 days before hand, and my boyfriend didn't even finish. I'm most likely being paranoid here, but I'm 17 and finishing year 12. What I'm asking here is, is there any way I could be pregnant? I'm petrified and I know if I knew I'd feel like this I wouldn't have had sex in the first place, but please if you have any experience with this, let me know how it turned out. Thank you for getting this far in my little ramble! Sorry for taking up so much time and I hope you have a wonderful day!! Xxx