Hi Smallone....
I highly doubt if you are pregnant.... You have has your period after this incident right? How late are you this month... and are you usually regular....
I would relax and not worry too much...... In the mean time... Take high doses of Vitamin C 1000mg 2-3 times a day...or until bowel tolerence...... There are many natural methods of bringing on your menses..... if you are still worried in a couple weeks..write again I can direct you too some support groups..and info.
Be careful when you engage in sexual activity with your boyfriend.... be protected.. so you dont have to worry like this again...