Help please

Walker

I have been TTC for the last 5 months after a D&C on July 2nd. Before the d&c I had 3 miscarriages but never had trouble actually getting pregnant. I had the d&c with kinda clean out and start fresh attitude. Since the d&c I can’t conceive at all. I just don’t understand. Has anyone else had this happen or have any insight or advice? Its so defeating.