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If you had unsafe sex on 10th day after periods then it is the ovulation period during which the chances of pregnancy
are high.If she has taken cerazette
on 10 th it self it is fine but if she has taken cerazette on 14th then it will not help.And now she should not take I-pill as it will not be useful because it is a emergency contraceptive pill
and is supposed to be taken with in 12-24 hours and not after that.So the mistake has happened and if she misses the periods then you can get the urine pregnancy test done and if that is positive then consult a Gynaec and if the pregnancy test is negative you can relax and be careful next time.