I had a chemical pregnancy last month and now I tested (evening urine) and the first test has a vvfl

line (I think) so I tested in the same cup with a FRER 5 min later and it's negative and then just in case 10min after that I tested with another cheap pregnancy test and it's negate. what's going on?! did I wait to long and the hCG evaporated or is it a false positive?

any advice or help would be greatly appreciated