False positive?

So my period was supposed to come on saturday, but it hasn’t shown yet. last thursday, I took a test and got a blaring positive. but then every single test i’ve taken after has been completely negative. I think i’ve driven myself insane trying to find lines that are just not there. again, no period. nothing. but completely negative. I don’t think this is a chemical pregnancy, unless my period randomly shows, but has anyone had this happen? i’ve never gotten a positive test without being pregnant but this just isn’t making sense and i’m starting to get anxious. posting the pic below so you can see