I know really dumb question

Tori
My question is why do the cheap Walmart dollar test bleed I've had two positive pregnancy test and they start bleeding after a couple hours I have a negative test now that's starting to bleed why is it doing that my OB/GYN is no help she didn't want to look at the pregnancy test that I had she keeps insisting that I am not becoming pregnant at all but this has been happening every month for the last four months and it's really starting to seem like I am becoming pregnant but their chemical pregnancy's because they're clearly positive but after a couple hours they start bleeding there still positive till this day except for two of them which is one of them was already negative and the other one wasn't why are they bleeding I didn't spill anything on them after I take them I put them on the bathroom counter or I bring them to my room and put them on my dresser until about two minutes after that and then I look and they're positive or negative but after an hour or so they start bleeding why is that I know I keep asking the question over and over but can somebody please help me somebody that is more informed on why this happens thanks so much every comment is appreciated even if you don't know why this happens and I had so many more test but after a while I just start throwing way these are just the ones that I took a picture of to show my OB but she is no help at all anymore