Faint positive getting lighter?

i took my first test 7/26/20 and got a faint positive, i took the second one on 7/27/20 and the line was darker. i took another on 7/29 and got a noticeable faint positive too. i took one today 8/1/2020 and the line is super faint, way lighter than the others. should i be worried? i’ve had some cramps but nothing severe and no bleeding. my first appointment isn’t until the end of the month. any advice? what do y’all think i should do or what’s going on?

08/01/2020