Is it possible to ovulate just a few days after period?🤔

Shirley

This is my first time using OPKs. I have an idea of how they work but the lines started light but then towards CD 11 and CD 12 they got darker which would have been 6 days after my period. After that, the lines started to go lighter again so is it possible i ovulated early? The <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says Im on my ovulation week. Please help.