Evap lines???

Faye • Currently taking 3mg Bromocriptine for high prolactin levels, 1000mg metformin a day for PCOS. 1 ectopic pregnancy ❤️
So yesterday I took a FR HPT. After 1 minute it was BFN. After 2 minutes still BFN. My other half thinks I'm crazy staring at the test looking for that extra line, so he grabbed it and threw it in the bin.
I went back to the toilet 5 mins later, ripped open the test and saw 2 lines. Evap.....???
I googled this and apparently you must wait a full 10 minutes. Any result after 10 minutes u must ignore. But 2 lines after 5 minutes ???? Anyone else had this before with a First Response?