For 18 years i have been struggling with endometriosis and for 13 years i have been TTC. What i have observed over the years is this:I have done insemination once and IVF once, what i notice was that after 8 days of my ovulation,insemination or the ivf i have done i always come down with cramp like my period, backarch, and high body temperature that i will become sick for the next 12-24 hours and after which  i will be ok without taken any medication. Initailly i didnt know what to call it and i thought is one of those things women need to put up with until this month when it happen again. I have been place on clomid for the last six month, and nothing seems to happen but the last month  ie the sixth month i took the clomid as usual and i monitored my ovulation which was positve and i met with my husband during the ovulation period, exacly 8 days after the ovulation i started having pain in my uterus, low back pain and very high temperature and for the next 24 hours i was in bed sick. I didnt take any medication and i was ok after about 24 hours and i do have my period at the normal date ie 14 days after the ovulation. These has happened to me aleast 8 times over this 13years of TTC. i dont know what it is and i would like to know.  Am i having implatation failure/ problem? or is my body fighting against the implatation? please if you have any clue or ideas to what is happening to me and the solution to such problem i will be please to hear from you. Thanks