It might jut be that your body is still recovering after the mc. I also had a mc in early march, and I O'd on the normal day (cd16), but had really low temps afterwards that kept on going up and down. Had some stinging on my left side near the ovary on 3dpo, then some central cramping 2 inches directly below my belly button on 9dpo. I'm now 18dpo, haven't done a test with FMU yet, yesterday did 2 tests and the first was BFN, the second had a super faint line that was almost invisible.
Since approx 10 or 11dpo I've been getting dull and sharp stabbing and stinging pains and aches on my left side, which I've discovered from reading is most likely the corpus luteum (what produces progesterone to support a pregnancy until the placenta takes over progesterone production around 10-12 weeks). So there is a possiblility it might be that.
It could also be your uterus contracting as the egg is pushed down the tubes, or it could be implantation.
Unfortuantely for many women mc's cause a lot of changes to the reproductive cycle, and it can feel like things are out of control, but it does get better after time. Just try to keep a record of everything that happens that is different from what it used to be and if you get really concerned ask a doctor you trust and like (I've had bad experiences with doctors not taking me seriously after 4 losses, so a doctor you like and trust is a very important thing).

Sorry I couldn't be of more help, and that I was possibly a bit confusing with all these posibilities, but I hope that I have helped a little bit.