I'm a bit worried because my period is late by 4 days this month, even though they've been regular before. Last month, my period started on September 2nd, but I had dengue then and maybe because of the fever or weakness, my flow was really low. Do you think there's something wrong or should I be concerned? Could you give me some advice on what to do next?

It's not uncommon for your menstrual cycle to be slightly delayed after an illness like dengue, as it can affect your hormones and overall health. If the delay is only a few days and there are no other concerning symptoms, it should be okay, but if the delay continues or you experience unusual symptoms, it might be worth consulting your doctor for reassurance.