I had the exact same thing in the first few weeks after my d&c for a MMC. I was 12 weeks but baby had stopped growing at approx 7 weeks. After the d&c I had lots of right sided twinges which I thought was ovulation because it came at around the right time in my cycle. Turned out to be an ovarian cyst that had developed. I have been prone to these in the past, so it may have had no relation to the miscarriage, but I had an u/s to confirm and check everything out before continuing ttc. The cyst is still there but will hopefully subside on its own with my next few cycles. The GP has given me the all clear to keep ttc.
Not sure if this helps you at all but it's worth mentioning to your GP, even just to have a u/s to make sure it is just ovulation.
The u/s I had revealed a couple of nice follies developing, so it gave me reassurance that everything was back to normal working order. It didn't result in a BFP for me yet but I feel peace of mind just knowing that everything looks good and is working fine.