Beccas
The sciatic nerve starts in the spine, then splits to the two thighs then splits again twice at the knee in each leg. So sciatic pain can be found in any of these areas. Like others have mentioned, it sounds like this because it is so painful and debilitating and also because you only usually feel one side of the body hurting at a time. When I feel it in my thighs it burns and stings on the nerve like crazy but feels very numb at the same time. A call to the dr or midwife will let you know. I have googled it and it is common in pregnancy (and other times) with no cure for it. I am the same weeks as you and find elevating the legs or getting off my feet must move baby away from lying on it!