Late period

Kayla • finally conceived our rainbow baby and getting married next year💙💚❤

Okay so I had my son 3 and a half months ago well I got my first period at 7 weeks like July 19th and I didn't get it at all in august and Its still late I'm now 22 days late and I took two different dollar store tests and they say negative I'm not stressed nor have I changed anything I just don't understand whats going on