Has anyone had issues with this?

I got this test about last Thursday (almost a week ago).

I bled 19-22 of December. But still felt off after bleeding.

So I took a test.. very faint line... but I still said it wAs negative because I had to tweak it a lot. Took this test 1-2 days later.. and got this immediately. I was so excited!

So I went to buy more and retested.. went back to faint lines.. for like 3 days. I’m so confused. Wondering if I should call my doc or wait till next cycle.

I’ve had cramps for a few days. But I’ve heard false negatives are more common than false positives.

ANYONE GET A POSITIVE AND THEN REST NEGATIVES AND END UP PREGNANT?