So me and my fiance had sex last night. Afterwards i was hurting because i have small cysts on my ovaries. My period is suppose to start the 3rd or 4th. I was spotting red blood last night so this morning i assumed it was my period so i put a tampon in. But when i took it out to change it all that was on there was very dark brown discharge. No red at all on there! Now im not bleeding at all. Has anyone had this happen before????? Could it be implantation only 3 or 4 days from period???