Hi and thanks for the query,
as you said knowing exactly when you ovulated is unknown so actually difficult to predict chances of pregnancy
or not. However, notion of risky sex gives already a chance of pregnancy. Its too early to expect to get clinical signs and symptoms or pregnancy now, even if you are pregnant. A pregnancy test after the 7th day could be positive. Symptoms usually appear later. I suggest you remain patient as you wait for your period or do a pregnancy test in the next couple of days. Getting a doctor examine your breast might be very useful in determining the cause of symptoms.
thanks and best regards,