Positive then negative test please help

Liv

So I had a very faint positive test and then another faint that I could barely see and then finally on the 15th I had a positive

^ that’s my positive and now then I took a test this morning and it’s 100% negative. What could be happening ?

This is my test from today ^

Please help. I’ve had 2 miscarriages before but I’m at a loss of what could be happening