Ovulation help

This is my second month using opk test strips.

Last month it worked but I didn’t get pregnant.

I ended up starting my period on Friday 2/28 and I’ve now just stopped bleeding.. like barely anything. So it lasted only like 4 days..

Took an opk test just to see and I got this? I know it’s not 100% positive yet.. but it looks like it’s on the way to getting darker? Is that possible??

My app says I’m not supposed to ovulate until 3/16. Which was 4 days off last month.

Any advice and help is appreciated! Thank you!!!