Thanks for the query.
I understand your concern.
If your expected date of delivery is calculated according to your last menstrual period or early pregnancy ultrasound, that may help in approximately identifying the date of conception.
In case of regular 28 to 30 days menstrual periods, according to your EDD, your last menstrual period is 27th January, 2015 and occording to that possibly you might have conceived around 7th to 11th of February.
If you are having irregular menstrual periods, it is difficult to calculate the date of conception.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.