I'm sorry to hear of your losses.

It's possible your hormones are still a little out of whack after your m/c. Can your GP run a hormone panel to check (ie CD3 hormones and 7dpo progesterone)? Otherwise, I'd say wait another month or two and see if it settles down.

Your GP could also check other hormones like prolactin, in case those are messing with your cycle. I had late O and a short LP (10 days) while I was BF (ie high prolactin) and still managed to get a BFP, so it doesn't mean it's not possible.