Dark red blood at 29 weeks?

I woke up to some dark red blood in my panties. Normally like what the start of my periods would be. It was maybe a teaspoon amount of blood. I wiped, it was a little more blood. But about 30 minutes later came back to pee, wiped, no blood. So I’m guessing the bleeding had stopped.

Anyone else experience bleeding like this ? If so, should I call my doctor ?