Why hello uterus

I am not completely sure if this is actually a pregnancy symptom, but it sucks and I am pregnant, so lets blame it on the baby. I have this intense pain in my butt. Yeah, like kind of in my hip, but more centered on my right butt cheek. It is acute and my best analogy is adding ice water to an exposed cavity. It doesn't happen when I stand on it necessarily, but any time weight changes, which is all the freaken time in case you weren't sure. Walking Ella almost made me cry, and speed walking with my kid today (we were very late for an interview) made me get light headed. I read online that you can have sciatic nerve pain because your uterus grows and presses against it. But come on! I am six weeks pregnant, how big can my uterus be? It hurts so bad, and when I sit down or lay down after it hurts, it sort of feels like a joint that needs cracked, except there is no joint and as soon as I move at all I get sharp, excruciating pain. And my uterus still has to grow, a lot. Maybe it will move or something. Or maybe it has nothing to do with my uterus. Regardless, I have morning sickness (at night it seems) and pain like never before. Awesome. I am tempted to call in sick tomorrow.