So confused

So last Sunday I got a positive pregnancy test. I tested because I was almost 1 week late and I've never been late a day in my life. Yesterday I took a digital and it said not pregnant so I took another FRER and it was also negative. All of these were with FMU and I don't know what to do. I have an appointment with my Dr the 24th I scheduled last week when I got the positive pregnancy test. I'm gonna test again in the morning but I'm not sure what to do if it's still negative? I'm 2 weeks late already....