I am trying for a baby and have been for about 3 months now, All months have come up negative. On Friday (7th march) i had sex and felt hopeful, I woke on saturday with very, very bad abdominal menstral cramps. The cramps have been on going for a few days now. This took me by suprise as only last week i was on my period (25th feb - 1st march) . Can anybody give me any advice please!