1 doctor agrees

In brief: Possible

If your first shot was 6+ days after your last period & you had sexual relations within a week of getting the shot then, you may not be protected.
Your periods will not completely disappear for at least 6-12 months so you may consider getting a pregnancy test done if you do not get your next expected period. Remember, the shot by itself as a contraceptive method fails 1-3% of the time.

In brief: Possible

If your first shot was 6+ days after your last period & you had sexual relations within a week of getting the shot then, you may not be protected.
Your periods will not completely disappear for at least 6-12 months so you may consider getting a pregnancy test done if you do not get your next expected period. Remember, the shot by itself as a contraceptive method fails 1-3% of the time.
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