Yes. You can have sex after taking the morning after pill, but you should use a barrier method of contraception (like a condom) until your next period comes. Even if you are on a regular hormonal contraception (like the contraceptive pill) you should use a barrier method, as the effectiveness of your regular birth control may have been affected.
This is because the morning after pill is only effective for one instance of unprotected sex: it will not protect you against pregnancy if you have unprotected sex again after taking it.
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