Our expert says:
Please tell me exactly when you finished the antibiotics. If it was more than 2 weeks ago, then you should be past the danger period now. You would either be pregnant now or not at risk. The usual suggestion is to use condoms to cover you during the at-risk period. If it is less than 2 weeks since you finished the antibiotics, then you can take the morning after pill until tonight. This will not necessarily bring on your period.
Antibiotics do not interfere with the efficacy of the injection, but there are pros and cons to both. You can read more about this under Contraception on this site.
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