How long after the contraceptive application ...

Good afternoon, I took the contraceptive injection on the second day of menstruation for the first time. From how long after the Contraceptive application can I maintain relationships with my husband without worrying about getting pregnant?
Expert answer:

In theory you can rest easy from the first few days, but since you can not guarantee and affirm with certainty, then it is best to take care for the whole first month.

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