What Are The Chances Of Pregnancy After Protected Intercourse?

Hi, recently me and my gf were trying to have sex, I put the condom on properly, and tried to put my penis inside but it wouldn t go in all the say, since she was a virgin, this happens the day before she was suppose to get her period, now she is almost 2 weeks late, but she is usually irregular but not usually this long, but she has been this late before, I m scared she is pregnant please help?