Leg pain..

Hello all.. I'm 9 weeks and 5 days.. Today when walking down my stairs.. With laundry but wasn't heavy at all.. My thighs started to hurt.. Hurt to the point that I had to drop the basket and sit. It felt as if I was doing squats and couldn't do anymore. I then needed to crawl down the rest of my steps .. I'm drinking my water and taking my vits. Seeing my doctor Wednesday for my ten week appointment. But has anyone experienced this?