So confused please help

Sydney • Fiancé to Cory 💍 Soon to be mommy to Myla Peyton Williams 🤰🏼due MAY 1st

So, i got my first positive on 2/8 and got another positive on 2/9. We BD’d the following days for a week and used Preseed. After that the tests continued to get lighter so I thought I ovulated already. I just randomly tested again today (the bottom one) and it’s dark again? am I ovulating twice? I’ve taken pregnancy tests and they all come out negative.