Implantation Help!

Famof4finally!!👨‍👩‍👧‍👦

I'm 11 dpo today and I dont know if I'm having implantation bleeding or if af is showing early. Yesterday afternoon I had menstrual like cramping and when I went to the bathroom, I had a small amount of brownish blood on the tp. Nothing in my panties. That happened a few bathroom trips and then the cramping and blood was gone. This morning I woke up with mild cramping again and had a little brown blood when I wiped again.

How long does implantation bleeding/cramping last?

I didn't have this with my first, so this is new.

I would love to hear others stories/experiences!