so I'm 15 and I had my last period on the 20th of October until the 25th or 26th, on the 1st of november roughly, I had sex with a condom and it didn't split but a few days later he ejaculated on my stomach, we wiped it straight away and I didn't move until he got rid of it all, I haven't had my period since and I'm starting to freak out a little bit, am I pregnant?