I am 38 wks pregnant.even I do face issues similar to urs.
I have slight pain and can feel some kind of expansion wheb I sit
I feel if u have a warm bath u would be fine
also its due to the pressure of baby, your vagina can get swollen and can also get varacous veins, try soaking in a warm bath and if that doesnt help you may need to put an ice pack on it to see if that helps if your swollen
I am 38w6d and am goo.g through the same thing i can barley stand or walk I think its ur hips spreading I went to the hospital last night because of it and got sent home best thing I could find to worn was a hot bath and tylonal hope this works for u