Should I worry

I started my period June 12 , 2020 it ended June 16 , 2020 my cycle length was 36 days I had sex July 7 , 2020 my expected period was July 18 , 2020 I didn't get no period for the month of July I'm currently on cycle day 54 it's august now and I still haven't gotten a period yet should I be worried my last few periods was January 22 , 2020 , February 29 , 2020 , April 3 , 2020 , May 7 , 2020 June 12 , 2020 should I be worried are is this normal a little advice would be helpful thank you