If you had unprotected sex then there is always a chance you could be pregnant. Spotting is not a good indicator. The only thing that will tell you for certain is a pregnancy test, either a home one or one administered by your Dr. Unfortunately no one on this forum can give you an answer either way. Good luck to you!!!
There is a chance but if you had a D&C you should try to wait, even if just for one cycle. I waited one cycle and lost the next one too. The best thing to do is wait 2 cycles just to be safe
I don't think you've given enough info. Have you had a period since your D&C? If not, you really don't know when you're ovulating.