R u just doing work out or on any weight loss pills.Sometimes it is observed in athletes that periods get delayed on strenuous exercise.Also if u r married u should do
pregnancy test and rule out pregnancy .Have urself checked by gynaec to rule out pcos.hence need for usg abdomen pelvis and cbc blood
sugar fasting pp free
t3 t4 tsh s
prolactin levels to rule out hormonal imbalance.Fat can affect ur menstrual cycle so exercise is imp so don't just discontinue. Get checked by gynaec