BFNs and 7 days late

Ok so I my period is really late. I've tested multiple times all with BFN (a few days before missed period, 2 days late, 4 days late and just now). Should I go to a doctor and get a blood test? Also I list took this test and it's clearly negative but the lines are 2 different color blues and I could see the horizontal line before I peed on it....yes I know the blue dye tests are not trustworthy but its all they had. So does that make it invalid? I'm so confused! 😂😂 and that's my daughters hamster, Barbie, peeking I the background!