Just curious?

When I was in high school, I weighed 220. After I graduated, I got diagnosed with irritable bowel syndrome and dropped down to 135. I balanced out and stayed around 145-150 before I got pregnant. I'm currently 18+4 and I don't really have a bump. I've gained 12 lbs but I just look chunky not pregnant. Could me being bigger back in the day affect the fact that I'm not really showing?