Sciatica has nothing to do with being preggie, and is, in fact, a spinal problem (pressure on the sciatic nerve). Just wanted to clear that up. And, as the way you spelled it doesn't present any google results, I'm guessing that you meant what I just explained.
As for the leg pain, while I do know someone who had a blood clot during pregnancy, I have also heard that leg pains are pretty common during it. I haven't even gained much weight yet, but my calves hurt for a week, and now my knees are hurting.
I don't know if I'm allowed to point to other sites, but this one gives some info on leg pain while preg:
http://www.babycenter.com/refcap/pregna ... h/250.html
(Sorry, mods, you can edit that out if you wish)
I wouldn't do the stretches on there until after you rule out the chance of bloodclot, though
Also, and I can't stress this enough, you HAVE to be able to communicate with your DR! I would look into finding one who speaks better english.