Thank you for your question. The estimated date of conception can be predicted from the first day of your last menstrual period. This will place you within a two week window in which you could have possibly become pregnant. This can further be supported by an ultrasound which can determine the gestational age of the child based on its size.
Thank you for consulting AskTheDoctor.com
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.