Positive then negative?

Kellie • Mommy to 2 beautiful babies ♥️

Hello! I took a test yesterday around noon and got a faint positive. Then took another at night and negative. Took another this morning, and negative. I’m not really sure on when my ovulation is as my cycles seem irregular. But according to my apps I ovulated on 01/21. I’m obsessive with tests, which I know is a downfall. Does anyone think I could be pregnant and had an implantation surge? Or what else could be the issue? Anyone else had this and got the positive they were hoping for? 🙏🏻