period week late not normal.no sex.boyfriend fingered me any possible way of this causing pregnancy?

My (now ex) boyfriend fingered me on saturday 11th and my period was due on wednesday the 15th.By saturday I still had not started and had to take norethromyicin tablets to delay as i had an all day horse and rider endurance day (no loo stops ) I stopped taking them sunday and my period still hasn't started. I know that I am probably worrying over nothing but i really want to know whether there is any chance that i could be pregnant. What if my ex-boyfriend had masturbated previously and not washed his hands (i wouldn't put it past him) before touching me?Unfortunately I cannot ask my ex whether he did or not, not just because we aren't on speaking terms, but because he is in austraila visiting his dad and I have no way to contact him, and even if I did he would probably lie. I am really stressed out and this is affecting my coursework, so i want to get a straight answer as soon as possible. I have tried other websites but have not had any responses. I am so worried that I am actually looking forward to feeling cramps.PLEASE help me as I don't know what to do and I have no-one to turn to.

your not pregnant... believe me. Signs of pregnancy wouldnt even show up by now...and you would still have your period...i suggest if you are so worried about getting pregnant...get on the pill, or take the morning after pill. I dont think ive heard of anyone getting pregnant from being finger banged...goodluck.