Confused mama

Megan

7dpo(9th September) positive strip test. But faint.

Then a digital says pregnant

Then a clear blue digital says not pregnant.

Every day since then tests negative.

Today.. pregnancy test at the doctors completed and the lines appeared within seconds.

I then did a first response to clarify.. negative.

Please help a mama out. I feel so disheartened.

Picture of today's doctors test.