Lossing hope 😭😔

I had positive pregnancy tests (Internet cheapest)on an one step test at 10,12,and 13. Frer got faint positive on 13 Dpo too. But I got my period on 14th dpo night. Its like light period and when I wiped EWCM with blood sorry for TMI.

And when I tested on CD 2 still got the line there.

Is the test invalid or something went wrong with me?

I have searched on the Web nothing helpful yet.

Any advice welcome.

Thabk you girls in advance. 🙏