10 days late

My cycle supposed to came on July 3rd i knew something wasn’t right because i usually get a sign my cycle starting. July 8 i took a pregnancy test came back negative took another a day later negative again. So Wednesday til today i got the light bleeding when i wipe but never on the pad so i know this not a period. Because it will stop can come back random times of the day. I never experience this with my son and he 12 now. Has anyone experience this before and how many pregnancy tests you too. I’m starting to feel like i wasting money to keep getting disappointed results