It can happen sometimes after fever. Do not worry. If persists, please consult gynaecologist to take medicines for periods to start. Please read https://drsujoydasgupta.continuouscare.io/post/8-ways-to-avoid-irregular-menstruation/2339
Health Tips
https://drsujoydasgupta.continuouscare.io/post/8-ways-to-avoid-irregular-menstruation/2339