Thanks for writing in.
and this does not usually cause cramps. Your cramps are more suggestive of mid-cycle cramping which is seen at the time of ovulation. So if you are trying to conceive, this is good news. Ovulation occurs 5-10 days after finishing the course of Fertomid. So it would be best if you have unprotected sexual intercourse everyday from today for the next 1 week.
I wish you the very best.