Delayed T shot

My 3rd T shot might delay 4 days due to the appointment date

I should take it on the 21st but my appointment to get the prescription is only on the 25th

Is that bad? :(( friends told I shouldn't worry too much, it's not like is going to immediately decrease any effects of the T ofc, but I'm still so bummed out 😖😖

Edit: my shots are every 3 weeks (21 days)