Clothes not fitting at 7weeks 3days

Hi, this is my first pregnancy and my husband and I are beyond excited! It suddenly feels like everything has a meaning 🤗 Anyway, I'm 32 years old and have always been between a US size 2/South African 6/30. I suddenly can't fit into ANY of my clothes, especially my tops and jackets. I've gone from a B-cup to a D-cup. I burst into tears yesterday because I really can't just go and buy new clothes, is it normal to get so big so soon? I'm keeping the pregnancy a secret for after my first scan so I can't ask any family or friends. Keep well all of you x