It sounds like dreaming to me, but it’s always better to be safe than sorry.
I suggest you give your vet a call. Ask to speak briefly about something you’ve noticed in your kitten; you might have to call back or wait for them to call you back.
If money is an issue – sometimes vets even charge for phone conversations – then watch your cat very carefully until its next regular visit rolls around.
If your kitten is 3 months old, you should bring it in to be fixed in about 4 months anyway. Otherwise, all pets should have at least yearly check-ups; some pets even more often.
If your kitten is in all other ways acting normally – high energy levels, eating/drinking/peeing/pooping regularly, no diarrhoea, no vomiting (or not too much, anyway; cats do get hairballs, after all), no mobility problems, no scabs, bleeding, abscesses, or fur-loss (give it a head-to-toe physical yourself, check ears and eyes too), no sudden behaviour changes (like hiding or aggression, or even uber-affection if that is a change) – then I wouldn’t worry too much about this: I’d wait until my next regular appointment and then bring up my concerns with the vet at that time. But, if there are any issues in these areas, bring your kitten to the vet ASAP.