Hi... im in ecuador and fmor the states... and I also haven't had mine for 3 months and am not sexually active...

I'm a little worried as well but a lot of my other exchange student friends have had problems with irregularites as well...

You posted your question as a answer to someone else's question, I have moved it to a question of its own

Stress, change in foods and more can all have some effect. If possible it is never a bad thing to discuss with a doctor if possible