Could I have ovulated?

Hello ladies. It seems way too soon to have ovulated but on CD 10 my temperature dropped a little bit and today it went up a little more. So Glow is telling me that I could have ovulated. I've been doing OPK with FMU every morning and it looks like they were all negative. Also the OPK got a 2nd line darker on CD 10 and lighter today. Why is that?