Late yet I keep getting a negative pregnancy test

Jasmine

I am currently trying for my second baby and AF was due September 9th and last AF was August 12th. I am on cycle day 53 and 24 days late but I keep getting a negative pregnancy test and last week I whipped and had a little brown blood but was gone that day. Anyone have any advice I can’t tell if I’m pregnant or not or if something else is wrong with me. I really am hoping it’s me being pregnant.