You stop having them until after the baby is born.
Some women do have period like bleeding in pregnancy but this rare. I had three period type months of bleeding for the first three months of my first pregnancy but I did have symptoms of pregnancy and the bleeding was different from my normal period x
It's different for each woman and each pregnancy. One of my friends experienced no bleeding during her pregnancy, and another had period-like bleeding for 3 mos. into her pregnancy. It's a case by case basis really.
While it is possible to have period-type bleeding while pregnant it is not the norm. Most women do not have bleeding while pregnant.
A period by definition would mean you are not pregnant. It is the sloughing off of the uterine lining. A fertilized embryo implants into that lining so if you were to have a true period that lining would bleed out.
BUT you can have bleeding during pregnancy; it just is not a period. The bleeding is typically caused by a hematoma, a placental issue, a cervical issue, old blood that has gotten trapped, etc.