It seems like it would be too early to tell, but some people are lucky to find out early about their pregnancy. I would ask her if you could see a pregnancy test just to be sure, or maybe ask her if you can go to the doc with her. Then if you want you can request a paternity test to prove that you are the father.

Thanks for your advice but then again she may not be pregnant.Well my question really is like i said we had sex on the 19 of Sep and 2weeks later she missed her period can it be possible 2 tell that early with the time frame if i got her pregnant or was she already pregnant.

Its usually too early to tell 2 weeks after sex. But some women experience sootting 2 weeks after if they are pregnant. Has she had any spotting? If not thats normal too. But like I said she can take a home pregnancy test! thats the smartest thing to do right now.