Yes, although one of the side effects of the contraceptive injection is alterations in menstruation. Therefore, lighter or irregular periods may appear, and even the absence of menstruation.
In this last case of absence of menstruation, which can occur when the woman has been taking the contraceptive injection for some time, it is normal to worry about whether an unwanted pregnancy has occurred. However, as long as the injection has been administered on time, the possibility of pregnancy is quite low.