What Causes Cramps And Sore Breasts After Having Intercourse?

hello. I think my girlfriend is pregnant. on this past friday she ovulated or so we think because through the week her sex drive was increasing, on the night she ovulated we had fooled around, we have not had sex at all for atleast 6 months but im afraid i did have sperm on my finger that night. she woke up the next day with slight cramps and on friday her breast were huting which was odd. she has also been haveing cravings. she just took next choice this morning is she pregnant?