Expert answer:
Can still take, will not affect much the effectiveness of injectable contraceptive there is always a certain period of safety (1 to 3 days), then with 1 or 2 days of delay need not be afraid, already with 3 days or more delay there is one small risk, but as insurance died of old, it is best to take care this month (use condoms for at least 10 days). If the delay is longer, for example 5 or more days, that is ideal if you take care of the whole month.