lower back pain

Sarah • Wife. Momma of 2 boys. (Nov. 2014) (Sept. 2016).
I'm 11 weeks with my 2nd. I have been having a lot of lower back pain (pressure). I don't remember this with my 1st at all. I read it's common later on when you gain more weight and pressure increases but I feel like it's too early. Anyone else experiencing this? Can you put my mind at ease? I'm probably going to call my doctor.