Is this a positive ovulation?

After a miscarriage, your hormones can still be fluctuating quite a bit, so an ovulation kit reading around that time can sometimes give a misleading result since the hormone it detects overlaps with pregnancy hormones that may still be in your system. It is hard to say for sure whether it is a true positive or a residual hormonal reading, and both are possible depending on where you are in your recovery. Given that your body has just been through something significant, it would be worth checking with your PD or gynae just to get a clearer picture of what your cycle is doing now.