Im 5 weeks pregnant with my 5th child and have a uncomfortable pressure inside my vagina is this normal?

No: Vaginal pressure is not normal in early pregnancy. You need to talk to your OB as having had lots of kids, you are more prone to things like uterine prolapse (fancy doctor term for your uterus dropping down where it doesn't belong). If this is the case, your doc needs to know tomorrow, and if having any pain or bleeding, tonight.

Probably normal: With each pregnancy and childbirth, tissue gets stretched more, and the uterus can begin enlarging more and sooner, so even @ 5wks, you may be feeling the weight of your uterus sagging and putting pressure into your vagina. As the pregnancy gets bigger, the uterus will rise and the pelvic bone will hold it up, so that pressure should start easing up around 12-14 weeks. Good luck and congrats! :-).

Yes: With the 5th child the ligaments holding the uterus up are already lax and the uterus may have dropped a bit already so this is a normal feeling.