hi. ok me and my boyfriend were intimate on the last day of my period and four days before my ovulation. Now im 12 days late on my period and have been having constant headaques. lower back pain, a clear discharge for like three weeks, and a little pain close to the uterus. it feels like menstraution cramps.. I need help. i took a pregnancy test and it came negative! Help please... COULD I BE PREGNANT?