So confused

I’m so confused, I swear I started my period this morning (which is actually when the app predicted it) when there was bright blood after some sexy time with hubby, so I threw on a pad before we left for the day to go around town. No cramping. Went to the bathroom a few hours later, and almost no blood! Now I’m heading to bed, threw on a pantyliner just in case, but I’m bone dry down there... I also had some slight brown spotting about 10 days ago too. Every single test I’ve taken has been negative 😫

Including one I took last night. Currently on cd36. Any ideas?