Pregnant or not

Hi everyone,

I’m supposed to get my period in 2 days, but yesterday I suddenly got cramps in my lower back and abdomen. We’ve been trying for 1.5 years now. Unfortunately, nothing every time.
Now I took a Predictor Early test today and there were two lines, but the line in the 'T' was initially very unclear and faint, and after about 15 minutes, the line became clearer and pink. I’ve never had a line in the 'T' window before, so I was initially very happy. But now I’m reading all sorts of things about evaporation lines.. (Will we get that again?) but I’ve taken multiple tests in the last few months and never got a line there. So I’m starting to go a bit crazy in my head. Can someone help me with this or has anyone experienced this too?
Unfortunately, I can’t add a photo.
I’d love to hear from you!
Thank you very much