Pressure in vagina.

Hi • Mommie of Twins. Baby A is a boy, Baby B is a girl.. I'm so excited and a new Mommie! 😊
Expecting twins, 27 weeks. When I walk I feel pressure in my vagina area, it's nothing I can't handle. But it kind of worrys me, I can also feel it occasionally when I'm sitting. What can this be?