OK so me and my boyfriend had unprotected sex 1-14-13 and then 2 days later I started spotting. Could I have inplantation bleeding? And also I've never had regular periods because I've been on depo but been off for a while.

No way we can know. If you don't get your period, wait a week and take a pregnancy test. Follow the directions. Somebody asks on the forums almost daily if they are pregnant and none of us are psychic - not even a doctor could confirm or deny pregnancy after a few days.

Yes that well could be spotting to show pregnancy.

If you have no idea of when your next period should be, I would advise waiting 4 weeks and trying a pregnancy test. If Neg, wait 4 more weeks and try again. Do the test first thing. In the morning with the first urine of the day