Pressure pain in lady parts

Jessica
Hey guys, so I'm 19 weeks pregnant with my 3rd baby and I am having some hard to explain pain in my lady parts. It's kinda like pressure down there. It's normally only if I sit for a long period of time but today we went to spend some time on the lake and the we walked about a mile to the spot and a mile back and it hurt the whole time! Anyone else having this kinda of problem? Do you know what may be causing the pressure? Should I be worried? Call my doctor?