I understand your worry about possible pregnancy. There might be a probability of pregnancy since there was 13 days between your sexual encounter and the first day of your last menstrual period. Technically you were on your fertile days if your cycles last 28 days.
I would suggest you to take a home pregnancy test using the first urine of the morning if your menses don’t show in your due date. I wish you the best.
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.