Is this sciatica?

Hi, I'm no doctor of course but I'd say what you're describing is classic sciatica symptoms.
From my own awful experiences with it, the pain for me always originanated deep within the hip socket and the best way/area to describe it is in the buttock. And sciatic pain travels from there down the leg, depending on the severity it may only cover the buttock/hip area, or spread down the back of the thigh, until in my case my entire foot lost feeling and strength.
I was worried this pregnancy with my back pain (this is my first pregnancy) because around the 14 week mark I started having odd twinges again, and even though it was bearable the thought of having another 5 or 6 months of pain terrified me. Well it wasn't the pain that terrified me, I can put up with that, but more the fact of thinking I wouldn't be able to take hardcore drugs for it and if I did seriuos damage again I can't easily have more surgery (I've already had two spinal surgeries in the past).
But the good news is, the pain left me after a few weeks! I've had a few twinges this week, now into week 37, but the rest o fhe pregnancy has been fine.
I've had a few various symptoms of pregnancy over its course, like back pain, cramping in legs at night, swollen feet etc but for me they last a while as though the body is adjusting to its new size/shape/position etc and then it gets used to it and then you start to feel normal again.
The cause of sciatica is the sciatic nerve is being pressed. This can often be because of an inflammed disk, so it is important to rest up and try not to be superwomen and give it time to settle down so don't overdo gardening and heavy lifting or bending etc.
So I hope the same happens for you, that the pain will go away on its own as your body adjusts. Other threads have talked about how others have coped, ranging from massage to accupuncture and heat pads etc. I'm not sure of the links to the threads because I'm not that good at searching/posting etc, but I'm sure others will suggest what has worked for them.

Gah...fun. Do you have to go to an osteo or chiropractor who is specialised in pregnancy, or can any of them do?

The best thing for me seems to be lying on my back flat out. I just can't get up again is all And sitting on the toilet is agony because it hurts to sit, and then I can't actually get up, so I'm stuck there. I hope it doesn't mean I'm going to get it for the rest of the pregnancy, if I've got it this early

Hehee that's what I worry about Sheza - Caden was a big baby and put pressure on your nerves, and I have two of them instead LOL

I think I will have a look around for an osteo, and a belly support band, because I can't do that regularly.

If you get it seen to early enough and maybe have regular osteo sessions during pregnancy it should be manageable, it is very easily treatable so don't put up with it.