Wondfo pregnancy test 😠UPDATE:::: JUST HAD A POSITIVE OPK AGAIN!!

These test use to work for me I took a test and came out faint line , after that I been testing every morning to see if they get darker but apparently I don't see it looking darker my AF was July 20, I had spotting few days ago...are these test positive or what, I mean the lines come out rite away just not darker 🤷 any idea what it could be,thank y'all beautiful ladies 💞 UPDATE::: I DID opk ITS POSITIVE,IM GOING TO SEE WHEN I GO DO BLOOD WORK,CAUSE I'M NOT FEELING WELL,