Me and my girlfriend had sex on 7th October. I always use a condom while we have sex. I ejaculated inside her vagina with the condom still on my penis. When I removed my penis we could see a white liquid discharge from her vagina. I checked the condom thoroughly for any tears but couldn't find one. Her regular periods should have started on 2nd October but they didn't appeared even on 7th and haven't had them even till now. P.S.- She started aerobics in the mid September, so could that be one of the reasons or could the only possibility be that she is pregnant because I have doubt in some corner of my mind that I didn't give a proper check to the condom.