never heard of the actual nipples being veiny,the actual breast does in pregnancy,but out of pregnancy also,so yes i would say wait a week and test.
Nipples have very blue veins
Well, there is no way to know until you POAS---- wait a wk, and see.
Do you mean your breasts are veiny or your nipples are veiny?
If you have been having unprotected sex and recently spotted, then pregnancy is a possibility. If the spotting was due to implantation bleeding (which happens to about 1/4 of all pregnant women) then a HPT wouldnt detect pregnancy until ~5-9 days later. Wait a few more days and retest with a good test.