Mostly brown but something pinky-brown blood/discharge

The day after my period was due I started having brown blood, not a lot like the very beginning of a period, 4 days later I’m still getting it, no red what so ever just always brown or sometimes browny pink, flow is very light now, no cramps at all, what could it be? I just feel like it’s not my period, I mean come on girls, when you know, you know 😂😂

Please please please I need advice