afraid of getting false positives

Hi there! My peroid should have started yesterday. i have been taking pregnancy tests using One Step strips for four days. All of them have been positives ( I've taken at least 10.) Should I be worried? Could just all of them be false positive?
I've taken one test from another company, don't remember the name and that ome came out negative the other day (before the time my peroid should have started.)
I just can't believe this!