If the last time he was wormed was a month ago, it's possible that he could have worms again.. I think. I'm not really sure. Even if he does have worms, it's nothing to fret about. The vet will give you a dewormer and it will all be over. You have to take basic hygiene precautions but of course those should all be routine and normal anyway. Don't panic.
When Franklin had worms, he had tapeworms, hookworms, and roundworms! I wouldn't even touch him lol. When we got Maggie and found out she had hookworms.. nothing changed. I've grown accustomed to it.