Does anybody else have this problem. I have 2 children and have not been on any form of birth control since my 15 year old was born. I have a fever that I get once a month nearly every month and it hits me at about 5:00 pm and I am fine again by the next morning. I was checked thoroughly about 7 years ago and ran almost all of the infertility tests for my husband and myself and they found nothing. I just want to know what is going on.