Digital results need help !!!!!

So I done a test a couple weeks ago and it said negative and no lines and then I thought I had my period was a bit lighter but not a lot and was only for 3 days when it’s normal 7 days. So I went to boots and picked up a digital test and done one before work and it said not pregnant and because I had the other one I couldn’t help myself but do it and it came back “pregnant” and I just don’t understand as I’ve done line tests and I can only see faint lines or nothing and I’m getting really worried and just want to know as the app is saying I will be 6 weeks tomorrow. So In total I’ve done 5 digitals 3 “not pregnant” but when pharmacist opened them the strip inside was positive but she thinks it was too light to pick up and I have 2 “pregnant” test too and it’s saying online that I might have to wait minimum another 4 weeks but I need to know what to do!!!!!?????