So Many Tests

I’m unsure how many DPO I am, but I’m cerrently 4w+4 from my period dates; I’ve been getting digital positives for 3 days now but the lines on some tests are dark & some are so faint you can’t even see them. Has anyone had this before with the clear & simple tests, this was taken at the same time as the boots one with the same sample. I’ve had multiple chemicals so very anxious of seeing faint lines 😬