Does Nipple Size Increase During Pregnancy ? Why Do Nipples Become Dark During Pregnancy And At Child Birth And How Can These Be Treated ?

on average how big do nipples change during pregnancy and giving birth i saw a picture of a woman giving birth and i freaked out because her nipple (the brown circle) was so big and it covered almost half of her breast!!!! it was ugly and im afraid to get married and have babies!!!! how big will nipples change during pregnancy and how dark will they turn?? and will they go back to normal?? if the nipples are already big, does this indicate that they will be extra large when pregnant??