test can not be wrong,because it indicates pregnancy hormones circulating in blood.
The depot shots are known to cause menstrual irregularity. The time taken for correction of these irregularities after withdrawal of drug is about 3 months, the bleeding problems you have may be due to the phase of correction..please wait for a month.Do use contraceptive
,if you are not willing for pregnancy.The period will take it's natural course by the time.
In case your periods don't get normal after two more months,it indicates hormonal
imbalance & treatment.
Depot preparations also cause weight gain. prominence of veins may be partly due to it. After bath the blood cirulation rises,causing temporary engorgement of veins.