Line and then no line

A

Hi guys,

Been trying for a few months now and my period is 2 days late (not particularly abnormal for me to be later than expected). I've been testing the last few days and had negatives all the way.

Tested today as I keep getting waves of nausea and I got what to my mind was a faint but clear positive. I then went and bought another test to make sure and tested again about 1 hour later and got a bfn. Super confused right now.

Would you guys say this is a positive and that the second one was because my urine was more diluted or the first one a false positive?

First test was the strip and second test was the FRER. (The second time I used a FRER and also the same type of strip as the first one)

Thank youu