Ariola and nipple changes

Jasmin 1 baby 👶🏼 TCC #2

Hello everyone I am 5 weeks 6days pregnant. One of the first signs I noticed before a positive pregnancy test and conformation from the doctor was changes to my breast.... they darken... well now they’re lightening ...but they’re getting bigger. Is this cause for concern? I assuming the reason they lightening is because they’re getting bigger... and sometimes they look 👀 dark... my husband said the same thing...