Ovulation after miscarriage

Leanne

The photo below was taken within the time limits. I had a D&C after a missed miscarriage 15 days ago. I took the pregnancy test to see if there's much hcg left in my system. There is a very faint line. I've been given the go ahead to try before I get my first period (my 19 month old was also conceived after an early miscarriage, before I got my first period). I'm just wondering if its possible for you to ovulate before your hcg reaches 0. My ovulation test is negative but high and I'm curious if it's just reading some of the remaining hcg as I know it picks that up.

Thanks for the help.