I have been having unprotected intercourse for 5 months I am 41, last month I had light pink spotting for 5 days on the second day the pain was unbearable in my back I went to bed with a hot water bottle, I have been checked for sti's all are clear and i did a pregnancy test wich was negative,my doctor put me on cezatte before my period I have had to have blood tests and am waiting for results, yesterday I started spotting again and today I have medium to heavy bleeding with lower back ache and bad pelvic pain