It's HUGE for 15 weeks... Especially compared to what it was at 15 weeks with my daughter... I've actually lost 5 lbs from the start of this pregnancy, so I know it's not just extra padding.
I hear you "pop" quicker with your second cause your uterus has "memory", so I assume the growth will slow down in the next few weeks. Cause I already look like what I looked at 20-25 weeks with my daughter.