Bleeding on Implant

Noona • 🇱🇧💍👶🏻👶🏻🇬🇧

Salam sisters. I am a little confused by this and no one really seems to know.. I have been bleeding on and off with no real pattern since having the contraceptive implant put in. I am aware that I am permitted to pray if it is not my period but what do I do in a case where I am not sure if it is my period? How does this affect fasting? Any advice would be appreciated.