"Period" during pregnancy?

Keaton
Any moms have a "period" while they were pregnant? I don't think that's what's happening to me but a friend of mine said she didn't know she was pregnant until 5 months because she got her period through her whole pregnancy. I asked if it was the same as she usually got and not lighter or different color and she said it looked and felt exactly the same. Her kid was born just fine and she didn't have any issues but I'm just curious if anyone else went through that?