In a female with a normal menstrual cycle of 28days, the ovulation would take place on 14th day of the cycle. So, 3-4 days before and after this 14th day is supposed to be the period (mid-cycle) when the chances of getting pregnant
And rest of the days are safe when the chances of getting pregnant are less or remote.
What is the normal menstrual cycle in her case? And is this happening for the first time?
So, get her pregnancy
test done. Ideal time for pregnancy test to be done is 1 week after the expected date of next date of menses.
Share the report with me for proper guidance.