Faint line on pregnancy test


Hey guys, so I’m on the arm implant birth control, and I got it in the first day of my cycle about a month ago. A couple days later my boyfriend came inside of me, it’s almost been a month and a half and I haven’t started my period. I have alot of symptoms of pregnancy and I took multiple tests, this week but they were all negative. Last night

Something told me to look at them again and two of them have the most faint line that it’s barely noticeable, but it’s for sure there. It’s a first response test too so I don’t think it’s an evaporation line. Thoughts?