Pregnancy pains

I haven't gotten my ultra sound to see how far along I am but I'm somewhere between 8 and 12 weeks. I have a son already and had a very bad pregnancy, during which I had a pinched ciatic nerve on my left side. I'm too early for it to have that much pressure on it so why does it hurt so bad this time?! I can't even sit on one side of my ass and I can't lay on that side. Please tell me there's a solution!?