Any help please I’m on birth control

Does anyone know why my ovulation test are so close to positive for this long. I just recently got the nexplanon implant and it’s supposed to suppress ovulation. This has me freaking out! I’ve only had sex once since I got the implant and we used a condom and it was after the initial seven days. But I just don’t know enough about fertility to understand why I’d be having such high readings for a week? Can anybody help. I can feel my implant so I know it’s in there and supposed to be working