Growing Pains?

Brittani
So I have this pretty bad pain, mostly on my left side. I only recently found out I was pregnant because I thought the pain was due to my ovarian cysts. I had a weird feeling so I took a test and it came out positive. 
Anyway, I just wanted to know if anybody else has this pain? My SIL says that she had it too in the beginning of her pregnancy and that her Dr said it is the ovary expanding, making more room for baby. 
This is my first pregnancy so I have no idea. I see a dr on Tuesday.