Its quite common to have pain in that general area in the last few weeks especially if you have already dropped (my midwife likened it to walking around with a brick in your knickers!) However if you think it doesnt feel right then speak to your midwife who will be able to put your mind at rest with either a quick examination or just by feeling your babys position through your bump.
Congratulations on the imminent arrival of your baby, hope it all goes as smoothly as possible
when you are on last trimester of the pregnancy you start to have alot of pain on your pevics and your hips. especially last month of the pregnancy this can be stronger as baby try to drop down. which mean baby is trying to position right to get ready for the big day. (thats when doctor examin you and can touch babys head through your cervix ) when the baby is dropping down you gonna feel alot of pain on your pelvics so as your vagina because of the baby weight and the pressure that why you can feel when you are walking. but walking is good because it help you to have easy labor and trust me i had 3 kids natural labor ( didnt have a time to get a abdoral) walking is the best. just when you are walking sit down time to time when you feel the pain. also talk to your doctor he can give you the belly support if it really bothers you. as along as you dont have varicos vein near vargina you should be good and most of the varicos vein is not that bad either but you still gotta tell the doctor about it. good luck to you and hopefully this help :)