Here is a 3d ultrasound image of a normal uterus:

And here is a 3d ultrasound image of a T shaped uterus:

My uterus also has an indentation on the top. In other words, the roof dips inwards. 

The space does look small. In my roof-dipped T shaped uterus, the space is even smaller. I think my mind is getting made up. I will do the surgery. Because I know that if I don't do this now, I will always regret this later, and wonder "What if....?"