Falling pregnant right after D&C

How many ladies actually fell pregnant before receiving their periods from a MC or D&C;?

I’m having the pinching feeling I felt when I was newly pregnant. I just had a D&C; on Dec 4th. But I’m feeling pregnant again? And my HCG levels were at 0, because they were tested. So I’m wondering if this could be a start of a new pregnancy.... I need everyones input!!!!!!!