Haan they change quite a bit, get larger and darker. It's all getting ready for breastfeeding. Mine felt very sensitive too. All part of the process, nothing to worry.
Oh yes, my whole chest decided to upgrade itself during pregnancy lol. Nipples darker, bigger, more sensitive. Completely normal, body is just being extra prepared yaar.
Yes, they enlarge and the colour darkens, and the area around also widens. Happens both my pregnancies. It's hormones doing their job for feeding later.
Yes they do! I noticed mine got bigger and darker and I felt a bit surprised honestly. Doc said it's the body preparing for feeding. Totally normal change.