Positive & negative

Hi all,

9dpo today with 0 symptoms lol.

Took a test around 7pm and thought I saw two lines, 4 tests later and noticeable positives, got a clear blue ultra early digital it said pregnant! Just did another at 9.30pm and it’s negative..?

Only drank a small amount aswell in between times?

Is this normal? Is it something else?

I don’t feel pregnant and I’ve had 6 miscarriages previously hence why I’m testing a lot lol.

Thank you xx.