Forgot to give the Cat its Antibiotics?

I forgot to give my friends cat its antibiotics 2 days in a row while they are away(Twice a day so i missed 3 doses because i gave it in the morning just not the end of the day the first day) now i am not there anymore to do so. I am afraid the cats going to die. Should i be afraid? The cat has been taking the antibiotics for about a week. This is for the last couple days. it is for a paw infection. the cat is also on the older side. I feel i have really endangered the cat. Should i be worried?!