Period?!?

Ok so this might be a super stupid question, but I’m TTC and I want to make every information I log and track is the most accurate.

I had my skyla removed back in February of this year. Since then I have spotting for 2-3 days right before I get my period. The spitting is not all day or Everytime I wipe or even if I wear a liner it’s a very small amount. The closer to the day I get my full fledge period, it’s def darker and a little more.

When tracking the day I ovulate, do I start the day I first started spotting or the day I get my full fledge period?

Thanks guys?