Veiny boobs?

I haven't had a positive yet but I've had a lot of symptoms even though I'm not really sure whether it could be pregnancy or just pms.. I'm due to have af on the 31st and yesterday j noticed a lot of blue veins on my breasts and little darker blue ones on my areolas? My breasts have been hurting a lot more than they usually do when I'm expecting af but does anyone get veiny boobs before af shows up? Or could I actually be pregnant?