post miscarriage cycle return

My husband and I found out we were expecting on 8/17. I had a missed miscarriage diagnosed on 9/17. Naturally passed the baby on 10/10 and HCG levels dropped to 0 on 10/28. I have bled off and on from the last of September. We got the okay from my OB to start having sex again, but every time we do, I have a bloody discharge, not necessarily straight bleeding but a bloody discharge that might stop within 10 minutes after sex and orgasm or it might last 2 hours. My husband and I are ready to start trying again after my period but I don't know when it's going to come and I don't know what bleeding to count as a period. Has this happened to anyone else? Just ready to start trying for our rainbow baby!