If you are taking daily PrEP, then do not worry if you sometimes miss one or two pills.
Everyone taking daily PrEP will get good protection so long as you take at least four pills every week.
Event-based dosing really needs all the recommended doses.
If you are late or miss a pill, just take it as soon as you remember and then continue as recommended.
Drug levels will still be high enough to protect against HIV. If you often miss doses perhaps it would be better for you to use daily dosing.
Everyone should now start PrEP with a double dose.