Veins on boobs??

This is probably TMI but I'm a little concerned. I am 10 dpo and I have blue veins on my chest and boobs and also across my nipple on my right one. I've checked for lumps and everything and there is nothing abnormal. I've been having soreness and aggravation in them for the past 4 days but it's too early to test. I'm not due for af for another 4-5 days. I'm just curious if anyone else has ever experienced this? I've never noticed them before this cycle. They are very noticeable too. Some are thin and others are thick and almost like an electric blue color lol. Very very blue. What the heck???