You are using Depot Shot and suffering from irregular heavy vaginal bleeding
. Now delayed period for more than 1 & 1/2 months.
Depot has some side effects like irregular menstrual bleeding with short period of amenorrhoea, prolonged infertility
,weight gain and failure rate 0.3 HMY.
So do a USG lower abdomen along with Thyroid
profile & LH/FSH to rule out underlying pathology if any.Then consult with your gynecologist and take advice accordingly.
It is better to change Contraceptive
Method if irregularity continues.Also control body wt by regular exercise,avoid fatty/salty food,avoid stress and sleep properly.