Hi,
Welcome to the ehealthforuma dn I am glad to help you. The chances of pregnancy in your case seem minimal due to 2 reasons. Firstly, you had had a protected sexual intercourse and secondly you had the sexual intercourse during the time when the chances of ovulation are minimal. Thus, you had the sexual intercourse during the safe period. However, to be sure, you can do the AIMstrip pregnancy test which is a very sensitive test for the detection of pregnancy. This should be done if you fail to have your regular periods.
I sincerely hope this information helps. Take care.