packing and donut

I have been pumping for some time now, about 8 months. I started to get discouraged with pumping but I read a thread lately about longer sessions and I am starting to notice an improvement in my post pump size. I normally use my 1.75” tube, but tonight I used my 1.5” tube. I only did one session at about 3hg and 20minutes. When I pulled out I began to get what I think is the start of a donut. It looks like bunches of grapes between my head and circumcision scare on the left and right side. Does packing lead to donuts more easily?