Positive on blue dye tests 4 weeks

Supposed to be 4 weeks 3 days and I’m finding that I’m only getting clear positives with blue dye tests, really faint on First response and negative on the 88 cent wal mart cheapies. I do not want to get confirmation from doctor until later since I had my first pregnancy and miscarriage two months ago and let it drive me mad and saw tons of doctors. Today would’ve been when my period was due. Got my first positive Sunday morning. Any advice or similar experiences?