I had my period on march 28 - april 2, 2016 and then I was suppose to start again on may 2 - may 8, 2016. I had unprotected intercorse with my boyfriend on may 1 and may 7 but he had a vasectomy done 2 or 3 months ago before we had sex. Now im having a yellow discharge and til today, I still havent started my period and its already may 15, 2016. I took a pregnancy test on may 12, 2016 and it came out negitive. Im not having any symptom, no change in my eatting habits or drinking but having constant yellow discharge.