Pressure by pelvic bone

I'm almost 11 weeks and I'm starting to feel a little pressure down in my pelvic bone area.  It isn't painful just feels like something is pushing against it.  Is this my uterus growing up over my pelvic bone already?  I have a weird small fat looking pouch in that area as well that I never had before.  It's my first baby I know everyone says your uterus starts to grow out around 12 weeks but could it be starting already?