I'm not quite sure but my Dr said if I see blood than I need to go to L&D so if I was you I would call Dr or go to L&D just incase.
It might just be your bloody show. It's part of the mucus plug. But if you're cramping also, I'd go to l&d cause it might be the start of labor. And better safe than sorry.
Now it hurts to stand up there is so much pressure.