If it is a significant amount of blood, I would contact your doctor. But if it isn't very much then I would suggest that it would be hemmroids. You can try Tucks pads, Witch hazel pads, or a cream like preperation H to help with the hemmroids, unless they are internal.
Drink lots of water, and make sure to get a lot of fiber.
Probably hemorrhoids, but if it perisits, I would contact your Dr. just to verify that's what it is.
Hemorrhoids are relatively common during pregnancy. Some women get them for the first time while they're pregnant.they often go away on their own