I'm not sure which board to put this under..

I had a D&C 9/6. I had "normal" bleeding which tapered off to spotting the first two weeks following the procedure, and my 2 week follow-up visit went well and even received the green light to continue to ttc. Then, 3 weeks post, i had an episode for a couple of hours when i just gushed blood and passed some sizable clots. OB told me it was AF. It was not. a week later, same thing happened. Finally ob brought me in for a sono, told me the lining looked good and everything looked fine except for a cyst on my left ovary which she will have me come back in 6 weeks to look at. Then this bleeding/passing of clots episode happened AGAIN last night - if my sono was clear, what the hell is going on? This is for sure not AF as it seems to have slowed to a stop once again. This is always right after i feel a lot of cramping, then i know the bleeding/clots will follow.

My ob has yet to tell me anything of note - if my sono was clear, what am i still passing? Is my cyst to blame? Do i need a repeat D&C? I am still getting faint positives on HPTs. It's now 5 weeks and 1 day post my D&C procedure. Would you seek a second opinion? This intermittent bleeding seems incredibly strange to me, and my dr has yet to take me seriously.