TTC after d&C

I’ve been tracking my ovulation. I’m kind of concerned but trying not to stress it too much. I have yet to have a peak on any of my opk test. Last month I tracked all the way up to the day my period started. My periods ever since the procedure have been excruciating pain as well. I’m just really confused and we want a baby so bad… I know every pregnancy is different etc. but in the past 4 pregnancies we conceived within the first month trying. I know that’s not common but with this being month 5 and the opk test not showing up any peak days I’m getting nervous that something is wrong. Has anyone experienced anything similar after having a D&C?