I had unprotected sex about 11 or 12 days ago and I got my period on the 6 and it ended on the 10 and on the 11 I have pink slimy discharge and I have been more tired than usual, I eat more and have gained 12 lbs, I urinate more often, I have lower back p

Doctor can evaluate. One's primary care doctor can check out a new or unusual vaginal discharge that started after sex. The doctor can check for a urine infection, if there are any urinary symptoms. Sometimes vaginal discharges are related to overgrowth of non-dangerous bacteria, but other times they are related to sexually-transmitted infectious microbes that need treatment. A pregnancy test can be done, if needed.