positive home test negative hospital test

my cycle is due in 4 days I have been spotting since Friday today is Thursday maybe every other day between those days! I would say light for the most part not enough to show a lot in pad. Sometimes brown sometimes a pinkish/redish I took a home pt on Sat it was positive took another on Sunday it was a very very very faint line went to the er and the test was negative! help!! I did research on implantation bleeding and from what I read it's not likely to be over a course or 1-3 days , I'm so confused and I can't see my doctor until Monday! HELP!!!