False positive?

Please no hate comments
So I decided to take a test there’s a faint line (positive) I had sex with a guy on the 13th and he was pulling out and another guy on the 14 and 15th had taken plan b on the 15th . Then thought I had my period on the 25th it stopped and started again then was spoting for a few days and took a test today due to having reflux and bit sick whats these chances of this actually being a positive?

Depends. Did you take. A blue dye test? Those always throw out false positives for some reason. I would retest with a link dye test or digital.