Birth control and missed period🤷🏼‍♀️

Long story short my period is late and I think it’s due to stopping my birth control pill( but I only took it for three weeks then had to stop because of side effects). I had protected sex (condemn) on June 28th, stoped birth control on July 19th, started my period (I believe it was my period but I heard about withdraw bleeding) on July 20th. Could the reason my period is late be due to stoping the birth control?

Hey