Hi dear, women body is under hormonal control, that act over reproductive system ( ovaries, uterus , tubes) and its get effected by (24 hours cycle) circadian rhythm.  So, many things can effect periods cycle.. even stress, day night cycle changes,sudden weight loss... As yours previous period history is normal so, there is increased probability of having some reason for your symptom.. Now what you need _ complete evaluation by Gynae doctor, starting from history, examination and then based on that if needed some tests to reach out final diagnosis. Then doc will start treatment according to your diagnosis.. first- don't stress Meet to gynae doctor

Hi. Please get an ultrasound pelvis done to look for any adnexal pathology & uterus. Also, get a hormonal analysis done on Day 2/3 of periods which should include FSH, LH, Testosterone along with TSH & Prolactin.

Pl avoid fatty food. Do regular exercises. To regularize your period. You might be having PCOD Pl visit my YouTube channel dr Alpa Khakhar For better understanding

U r having hormonal disturbances so for proper treatment consult a gynae inperson

If ur sexually active get a pregnancy test done n a scan to rule out Pcod.. also get a thyroid test done

Need to rule out polycystic ovaries and thyroid disorders..

Are you married or sexually active? If yes, to do pregnancy test. If no, to do : usg(pelvis), fsh, lh, TSH