Please help. . .

ive had the inplant put in a few months back, and im constantly on my period. I'm not too bothered about that, even though it is quite irritating and i do have to spend more money on pads and what not, but my biggest concern is that when my partner and i are intimate, we've both realised that i do bleed quite excessively, and im not sure if this is normal for the inplant, or theres something wrong, or if theres anything that could cause this like high stress levels or diet? and if theres any way i can prevent this from happening?
thanks.