Implantation bleeding or early period?

Hi, ttc after a miscarriage in May..

Have been tracking everything like a hawk.

Yesterday, day 21, I start bleeding -my cycle is 25 days typically- so I tell myself it's implantation bleeding..it was pretty light.its heavier today, pee test says no baby. But I'm still holding on to that hope that it could be the implantation..believe I didn't bleed with my first pregnancy (resulted in mc) but was wondering if anyone has anything to share that might help me really believe in this. I'm just so frustrated with this, it's all I can think about. I want my rainbow baby!