Ovulation after miscarriage

Hello,

I passed my baby at 9 weeks naturally last Saturday. My baby stopped growing at 6 weeks 5 days. My pregnancy symptoms had all but disappeared. My bleeding ended Thursday, and I decided to start <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>, and Friday for a super positive opk and even more so today.. but today only makes 7 days since. Is this possible? Or is this just residual hormone from the pregnancy.

Thanks-