Birth control Implant

Alayah

So I’ve been bleeding since September 28th I just got the nexplanon back in August. I had my regular period cycle from the end of August to Sometime in September(for like 6 days) but for some reason this time around the bleeding isn’t stopping. It’s now been over a week😩. Is this happening because of the implant or because my roommate and my period is synching? Hers has been on since the 9th of September