Late period

Allie

Hey everyone....so I was supposed to start my period yesterday according to the app. I have taken a few tests and I'm not seeing any lines (vvfl once but then it's been gone since). Still no signs of my period but I also have been checking my ovulation and my line has been getting darker and darker each day. It's like one shade away from testing positive. Any idea what's going on or why this would happen?