Birth control bleeding

Okay so like I’ve been on the birth control implant for about a month now and ever since my period ended, it was super light for 3 days, I’ve been getting like spotting almost. Like it won’t be a lot but it’ll happen throughout the day and night. Is this normal? My period ended the 17th, I’d like to say because I’m not bleeding anywhere close to enough to use a tampon or pad or even a panty liner, and it’s the 21st now.