I need some help...

Starting the 19th of July I have had on and off very light bleeding. As of yesterday my bleeding picked up a little bit but later on tonight I noticed the bleeding has stopped again. I have taken 4 pregnancy tests all have been negative. this is around the time that my period is normally due but my period isn't never this light and never on and off. I don't know if I should keep testing or just wait and see if this turns into an actual period. It's been 4 days now and I'm just over the back and forth bleeding and confusion.