I think everyone is different but mine was normal right away. I had a d&c in April, then felt clear o signs 13/14 days after the d&c, thought I'd try an opk, had two days of positives like I usually would, with strong o pains and then negative. Af came at 28 days exactly, so normal cycle for me (though we weren't ttc). It was the same the next month, o on cd14, and I got pregnant with this baby that 2nd cycle (that was end of May/June). I imagine it depends what your cycles were like before, and I don't know if it would be different if you had a natural mc. Hopefully though you'll find it all goes back to normal quickly. I know for me I found it all really healing to feel like my body still did what it was meant to do.