Wacky period

Nika

A little backstory,

2 months ago, I gave birth. After 5 weeks I started my birth control (mini pill) and got my period.

My next period shouldn’t for another 2 weeks. However yesterday I started cramping and bleeding a little. Not enough to soak a pad but it did leave a spot on the bed, unexpectedly.

Is this normal? I’ve never been on BC before.