Blue Veins, 4 days late, neg preg test 1 week and 3 days ago...?

I have blue veins all over my ...slight cramps...back pain...little bit nausea craving fried oysters and blue cheese and sauteed mushrooms... 4 days late so far on period took a preg test a week and 3-4 days ago...i know take another...but are the blue lines a sign...oh and headaches i could have gotten pregnant anywhere between sept 21 day i got off my last period and now i guess regular periods on time always...3 days long heavy and 28 day cycles...let me know what you think called my doc she said wait 14 days after period is due to test...im nervous any comfort...i supposedly have endometreosis...always had painful periods