###Human: Why am I having tender breasts and breathlessness after unprotected sex? ###Assistant: Hi. As your cycle length is 27 days, and you had unprotected intercourse on day 8 or 9 of your cycle and that was the most fertile period of your cycle. So, do not worry, wait till your next periods. If they occur in time, then no pregnancy but in your case, the chances of pregnancy are more. If pregnancy occurs, then after an ultasound, if it is in the uterus, then medicines are there for an abortion.