I am 38 weeks and my babys head has been low for a while now I also have been dilated a 3 for over 2 weeks & I am almost 100% thinned out but still NO baby so it could be soon or it could be weeks. Also as far as the leg thing the only comfort I can find is soaking in the tub but when I get out it starts right back up. Good luck.
I got some restless leg at night and it is really hard on me. There is no cure but everyone says it goes away after baby arrives.
As for mucus plug, I lost mine around 37 weeks but went to 40 weeks despie baby being nice and low at 35 weeks already. There is no hard science between losing plug and labor. You are sooo close to your due date though!!!