Hello dear,
Understand your concern
Please note that depot shot contain synthetic
progesterone and following are the common side effects depot shot:
gastrointestinal disturbances
nausea, vomiting, changes in or loss of libido,
abdominal discomfort,
headaches,
nervousness,
depression and mental changes,
vaginal discharge,
lactation,
dysmenorrhoea,
breakthrough bleeding.
So i think it is a side effects of Depot shots as you are using for first time.
It will goes with in 2-4 weeks.
You can check pregnancy by urinary HCg kit method after 7-10 days of missed period , if you had unprotected sexual intercourse.
If not resolves, you should consult the doctor and do the following tests:
Hormonal profile: E2, Progestreone, FSH, LH, Prolactin, HCG, Thyroid hormone profile.
USG abdomen
Endometrium biopsy
Ovarian follicle study
Hope this may help you.
Best regards
Dr. sagar