I had my periods on 11sep and I had sex on 17sep I...

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assuming that your cycle is 28 days ,and your first day of menstrual cycle was on 11th september ,this means your next menstrual period will be on 9th October .
so your day of ovulation was on 25th Septmebr ..
so if  you had sex on 17th Septmebr ,there is no risk of pregnancy ,
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