I was getting something for my ds from the cupboard in the kitchen when suddenly I got the most debilitating, excruciating pain in my right leg. I couldn't walk. It was pure agony. It felt like my leg was going to go from under me. That was about half an hour ago and I still can't walk. I have to stay sitting down. I'm 21 weeks. Any idea what this is? I don't think it's sciatica or spd, as the pain seems to start from my knee and radiate to the rest of my leg. Just a bit worried about a blood clot. Or is it just because my ligaments have softened. It really is incredibly sore when I stand up.