My doctor switched me to a different birth control pill last week and I only started taking it this past Monday. I was alright Monday although I have had a busting headache every afternoon so far this week and had nausea and vomitting the past 3 mornings within half an hour of taking my birth control pills. I started bleeding yesterday afternoon and though perhaps that it's breakthrough bleeding because I'm switching my pill, but now it's quite heavy and I have quite bad period cramps. I'm booked in to see my doctor first thing tomorrow morning. My doctor has refered me to a gyneacologist, I'm seeing him in about 2 weeks - my doctor seems to think I have endometriosis. Could this bleeding while I'm on the pill and even though I'm on the pill and every thing like periods, bleeding and hormones being out of whack be caused by endometriosis or is it just that my body doesn't like any birth control pills...?

I'm definitely NOT pregnant, have had a pregnancy test probably 5 times in the last few weeks and have not had sex in probably 5 weeks as I've been having bleeding between periods, thrush and pain with intercourse... which my doctor says could all be signs and symptoms of endometriosis? Is this true? I'm 26 tomorrow and do not have any kids yet. My Mum had endo too and had a hysterectomy at age 31.