Our expert says:
Although the risk is lower when ejaculation happens without penetration, it is still possible to fall pregnant. Factors such as the closeness of the semen to the opening of the virgina and whether the female is in her fertile stage of her menstrual cycle will however have a bearing on the likelihood of the woman falling pregnant. - http://www.menstruation.com.au/periodpages/couldibepregnant.html
If you want to make 100% sure I suggest that you contact your General Practitioner.
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