ONE SORE BOOB!?

The veins in my right boob are sticking out more so than th left, but both boobs are tender. My nipples are inconsistent with their looks, they'll appear bigger and darker then bigger and normal color again. Can you be pregnant and see the veins in one boob more so than the other? Or have one breast more sore than the other? I mean they are both tender but I definitely think the right is a little more sore. They feel hard too, kind of like a tennis ball grew inside my boobs lol. Please help me understand. Ttc #1