I generally use First Response and Clear Blue pregnancy tests. Since Sunday, I’ve gotten about 10 (maybe exaggerating a little) positives from First Response. On the pink dye ones, the line is clearly getting darker. On the digital one, it’s positive. On the Clear Blue blue line one, it’s positive (I bought these by accident, but was too lazy to return them). On the Clear Blue digital, it’s negative. I can’t say for sure how late I am because of a miscarriage that lasted three weeks in January. Why is the Clear Blue digital one negative? Has anyone else experienced this before?