High blood pressure that develops during pregnancy is called gestational hypertension. It usually starts after 20 weeks of gestation or close to delivery. Your blood pressure will most likely return to normal after giving birth. However, if you have chronic hypertension before your pregnancy, you are at risk of complications such as preeclampsia (kidney or liver damage) and eclampsia (seizures) during and after your pregnancy. Speak to your doctors about managing your hypertension during your pregnancy.