i have taken a pregnancy test at a doctor office,i am not pregnant. My last normal period was three weeks ago. i have been cramping and having a rust colored dischage for the past 3 weeks.the doctor i went to said that my vagina region looked normal, but had some inflamation. when my husband and i have sex it is painful to me, and it feels as though he can't go into me as far as he usually does.I know for certain that neither one of us had sex with anyone else. so i am not worried about an std.please give me your advice and maybe a couple of things that could possible be causing this. thank you