How To Confirm Pregnancy?

Might I be pregnant by foreplay? or is it just dysmenorrhea? Hi please please help! I m worried sick right now! I m 17 and recently my boyfriend and I got Kind of sexual and by that I only mean foreplay. But I am afraid I might be pregnant because I have no idea if he might have touched his penis (and maybe in the act have gotten semen on his hand) and then he tried to finger me, I must add that HIS FINGER DID NOT GO ALL THE WAY IN AND BEFORE HE DID IT HE KIND OF FIRST RUBBED THE OUTSIDE OF MY PANTS SO IT MIGHT HAVE DRIED OFF (but I m not sure), but this happened several times so i m really concerned that some of the sperm might have gotten in. I am thinking that it might be unlikely as his hands were only on his shaft once or twice, but I m still not sure... But recently a week before my period i started getting severe cramps and sore muscles once or twice, then when my period came i had sore bowel movements and also very bad pains and my period continued for 2 days longer than usual... then my period stopped and i still have trouble with my bowel movements and feel very naucious. I have seen 2 doctors about this (but did not tell them about the foreplay part as I am ashamed because I NEVER usually do things like that which is why i broke upwith my boyfriend) and they claim I have dysmenorrhea... and prescribed a birth control pill to regulate my period... but now I m scared that the actual cause is pregnancy... PLEASE PLEASE HELP!????