26 weeks today & important ? . .

so for the last 3 days I've been having slight pain in my pelvic kind of vagina area and in my thighs. Lower back pain while standing &. it kinda hurts when I open my legs a little bit and when I try to turn over to switch sides in bed. as well as when I walk a little bit. Feels sore. This is my first pregnancy and I'm not sure what this could means. however is anyone else experiencing this?? if not do you know what it could potentially mean. I have an appointment next week and was wondering if I should call my Midwife sooner..please help!