Hi guys I’m just looking for some help - on the 6th I had unprotected sex, the next day I took a plan B, yesterday on the 16th I began bleeding out of nowhere which was strange as my period isn’t due until the 28th, and my period is usually on time with no bleeding in between, but it started very light red/pink like the beginning of a period, and today I have filled half a pad of which the blood is brown like the end of a period. Does anyone know what this could be?