Okay so April 13th my boyfriend and I started ttc. I almost always start my period around the 5th and have never missed a period. When it came time for my period I just had this brown discharge very light only when I wiped and it lasted about 4 days and stopped and I never actually had my period. I've taken 5 HPT and all negative... is this normal? should I do a blood test? And if so when?...