Normal. Extra horomones and blood flow. You will most likely get darker nipples and my boobs stay red all the time. I am 36w.
I'm a ftm also & was shocked by the changes down there! I read it's b/c of increased blood flow & at 35wks+5 I can tell you it only gets worse! Everything's swollen & dark & can't shave b/c of how sensitive my lips are! Tmi I know, but you're not alone!