Pill Causing Problems ??

Cosima
So I'm 17 And been on the pill only a month. Three or so weeks ago I had unprotected sex and he came which freaked us both out. 
But since then I've had two separate periods both of which hurt like crazy,  so I figured I couldn't be pregnant, after the first one though I began having weird chest and stomach pains. The chest pain just burns and tightens up it hurts to walk talk or even breathe and now it just comes on after I eat which is scaring me since I've heard you can get blood clots in your chest area. 
Should I be worried about that being the case of just normal symptoms from being on the pill ?? 
Me and My Boy are really really worried. 
Thanks in advance if you have anything xx 😰😰