sir / madam i have sex with my girlfriend 2 months back til now she not get periods she is in pregna

better to do a pregnancy test ... it is cheap 

Have you had unprotected sex? If its been two months since her last period has she taken a pregnancy test? You can get a test at the dollar stores or 88 cents at walmart and they work just as well as the expensive name brand ones. If its negative she needs to make an appointment with her doctor to get checked out about not having her period because something could be physically wrong.