There are several reasons for missing a period when you arent pregnant, these include the following-
stressexcessive weight gain
Normally I would recommend that you go see a doctor to find out exactly why you've missed your period, so that he can either prescribe you medication or recommend what lifestyle changes you need to make. But in your case it seems like it was only a one time thing, so dont worry about it. But if it happens again, see a doctor.
I hope this answered your question.