I agree with @tambcat. DD was 16 months when I got pregnant, and I was about the same pre-pregnancy weight. Your body just remembers! I'm 13 weeks now and none of my regular pants fit, and last time I wore them until 20+ weeks. I look like I did at 18 or 19 weeks last time. Thick but no belly popped yet.
My BFF was noticeably pregnant the second time around at 8 or 9 weeks and her son was about 1 when she got pregnant.