Premom Tests

Has anyone used Premom pregnancy tests and gotten false positives?? I have been using that one and the Amazon brand pregnancy test right now and I can see a faint line on the Premom but clearly a negative test with the other brand. I’m so confused. I was using Premom to track ovulation but missed a day and had a day where I drank too much liquid so I don’t know what day I was technically ovulating. According to period apps it would be the 18th/19th and according to Premom is was the 12th. So because of that I don’t know how many DPO I am.