Positive tests? With negative blood test...

I’ve had several tests that appear positive. I went to get a blood test today and it was negative. My last period was January 29th. The doctors office said that they only measure anything reading 10 or above. My periods are very regular. When am I even supposed to start my period? This app says now. Another app says later. I have no idea. I don’t know what to think. Help!

I think I’m just getting my hopes up. 5 years of trying to conceive. I give up.