Bra sizing

Hi ladies! So I know with pregnancy, your bra size goes up. With my first I went up two cup sizes, and it was gradual. With this one, I've gone from a 36B and was measured today at just over 14 weeks at a 32DDD 😳
Has anyone else gone up in size so drastically and so quickly? Also, I've only gained a total of 5 pounds, so I'm not sure why they're so big!