I have been off the depo shot for 4 months and have not had my period return. I have however expreieced some very faint pink spotting once a day for several days. My problem is that this "pink" would be the right timing for implantation (7-10) days after unprotected sex. I have taken a HPT and it was negative, but since I have not had a period I don't know if I would be late yet. Anybody have any ideas or have you experienced anything similar?