Abbie, I see that you are starting to get that dark line going from your belly buttom down to the pubic bone. This is called the "linea negra," which is very common in pregnant women. I understand that women with dark hair usually show this line more prominently that fair hair pregnant women.
I never got that, since I am fair haired and fair skinned. I just had stretch marks so large they looked like the sand traps on a golf course. Maybe you'll get through this pregnancy with very few stretch marks. I don't think you are carrying a large baby, but do believe that she is a long baby. You seem tall, so maybe she will take after you. Keep up the fine work, litte mother.