That's good. You have been taking good care of your tamagotchi Eventually your tamagotchi will beep But if you take bad care of it. He/she will beep often. Your tamagotchi doesn't beep when it has to use the restroom.
Thats actually a good sign. Tamagotchis need alot of attention but to me, youre taking really good care of it! If you want it to beep just....stop playing with it for a few hours.. just expect the unexpected