No, it's not true sciatica. It's called piriformitis. Many people are misdiagnosed with this, especially pregnant women. The sciatic nerve pierces through the piriformis muscle and when the hormones are changing/acting up/etc., the pririformis get inflammed and puts pressure on the nerve causing sciatica-type pain, but it's not true sciatica.
Also what you are describing along with it is Symphysis Pubis Dysfunction.
Here's a concise explanation with something you may try at home:
http://womantowomancbe.wordpress.com/2008/02/12/pain-in-p...
I, fortunately have a great chiropractor who is a woman, since none of my male chiropractors have ever checked my pubic bone. It was night and day after an adjustment. I am in my 4th pregnancy and I honestly have no idea how most women deal with "normal" pregnancy pain - and why, when there are answers. I see a midwife, so they are more open to chiropratic, but some of my firends were told by their male OBs that it was normal and there was nothing they could do for it besides Tylenol. They finally went to see my chiropractor and were so mad that they lived with the pain as long as they had, when there was such an easy solution.
I even get adjusted in labor. The last labor, I was having contractions for hours at 7 minutes apart, so I called my chiro, got adjusted and instantly, they went to 3 minutes apart. 45 minutes later, my water broke and 20 minutes after that, my 10 pound 4oz baby was born.
You might be able to find a chiropractor proficicent in pregnancy adjustments, etc here: http://icpa4kids.org/Find-a-Chiropractor/
Good luck, sweetie. You don't have to live with it.