Guys...I dont know what to think. Im on CD 21.....had sex ONCE this month on CD 14. We arent really trying right now. Been too busy...i had mid cycle bleeding once only right around expected ovulation time and my ovulation signs came and went on Sunday-Monday. Is there any chance this is implantation?  I was feeling very tired today and just some mild breast pangs. Normal cycle is around 29-30 days on average with the longest going to around 32, but overall feel fine....little faint headache that came and went yesterday and today...my AF is due in about 8-9 days.  What do you guys think?