My friend and I has sex about three times in three days... He didn't ejaculate inside of me because we started to have sex but did not go all the way. It was around the week after my period... I get my periods around the second week of the month. That was back in September, we are about to enter November and I have not gotten my period. Lately I have been stressed, and I had a cold about 3 weeks ago.. could I be pregnant? I don't feel any symptoms. Should I take a HPT?

Yes, you could be pregnant.
Yes, you should take get an EPT from a local store so that you can know for sure.