How likely is it to bleed while pregnant the first few months?

Can happen: There's been several recent cases of women who didn't know they were pregnant until the baby was delivered. All were intelligent women, who had delivered babies in the past. Part of the reason they didn't realize they were pregnant was that they still had their menstrual cycle throughout the pregnancy. So it is possible. May not be common but it is possible. So if you think you're pregnant, you need to do a home pregnancy test to make sure.