http://www.thebump.com/a/leg-pain-during-pregnancy
U can refer to the above article to find out more. But most importantly is that if it is troubling u so much, u should let ur Gyne know to see if there are any other problems like fibroid or thrombosis. Usually the leg pain kicks in during the 3rd trimester tho. If it's really nothing serious, I think some stretching, massage, alleviate the leg at night can all help it too.
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Mommy of 2 sweet magician