Depo Shots can cause menstrual irregularities and Amenorrhoea also. But the good thing is that in your case you will soon start your normal cycles. Your spotting may followed by normal period or if not this time, you will see your normal cycle soon. Depo shots causes slow release of Hormone progesterone
for three months. Once you stop Depo, there will be withdrawl spotting or bleeding.
You should start Tab Folic Acid
.5 mg once in a day from today, and try for pregnancy
once you start your normal cycles. If you do not conceive within 3 months of trying normally, you should consult Gynecologist.