I've also experienced a numbing feeling in my thighs if I stand in one place for too long. Too long being about 20 minutes.
Im 10 wks too and somehow get this when I'm sleeping and the pins and needles are what wake me up. I'm also finding that my lower legs and feet remain cold when I sleep and I need a massage to get them warmed up or else face a sleepless night.
My hands and feet fall asleep ALL the time!! It's already driving me nuts