Pregnant?

So my period is late by 10 days and I've taken 3 pregnancy test and they all were basically negative except one that had a spot where the positive line is but it was the dropper pregnancy test and I'm worried I may have done it wrong plus they were also all a dollar. Has anyone experienced something similar or has a little bit of experience with those pregnancy tests? I'm just a little worried due to my age. Update: I've started bleeding but it's not normal, it's very fluid and it's behaving like an open wound. I may be over-reacting but with how late my period is (I've always been on time) and symptoms I'm worried this is not normal