Cramping two weeks after miscarriage. Please advise!

Dorothy
Hi everyone!!! I had an early miscarriage on August 4 , I stopped bleeding on August 9. I've been doing the BD here and there since then. Since August 20 i have had mild cramps low in my pelvis, with lower back pain as well. I thought maybe it was ovulation, but opk was negative... I did an hpt for the heck of it.. bfn! Anyone else ever had a similar situation. I know ovulation can vary after a MC. I'm not too sure what I'm experiencing.