conceiving right away after a MC

I had chemical that ended 12/1, my husband and I have been BDing ever since. How likely is it that I'm pregnant again? I feel like I ovulated between 12/6-12/10. I've had back pain, light cramping, what I believe to be implantation bleeding, increase appetite and sense of smell. I tested two days ago and it was negative, I'm assuming because it would be too early.