I as 23 weeks pregnant when I sit for periods of time and get up I get preassure near vagina but when I walk fir a bit it goes away  is that normal?

Could be. Pressure around the vaginal area is common later in pregnancy, and is due to the growing uterus pushing down on your pelvic organs. However, if you feel a lot of pain, contractions, have any vaginal bleeding or loss of fluid, or can not feel the baby moving, you should see a doctor immediately.