How soon after intercourse can you tell if your pregnant?

unfourtanly i had a one night stand, the girl called me and told me she was pregnant, it has been just over two weeks sence intercourse. she said she took a pregnancy test, but then she said that she diddnt take a test but she late on her period. today she said she was having pains in her belly. after the one... show more unfourtanly i had a one night stand, the girl called me and told me she was pregnant, it has been just over two weeks sence intercourse. she said she took a pregnancy test, but then she said that she diddnt take a test but she late on her period. today she said she was having pains in her belly. after the one night stand i quit talking to her for a few reasons, im really mixed up with the whole thing...could she be telling me this just so i would talk to her again? any help would be great
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