Having unprotected sex that soon after your period began, wouldn't lead me to believe that you became pregnant. I don't know your cycle completely, but a woman usually ovulates within 7-14 days after her period stops. the discharge is probably a result of having unprotected sex. I'm sorry that you're not feeling well, but if you're still worried that you may be pregnant, you should get a blood test done this coming cycle (beginning of May, and wait until you're late a few days) and you will know for sure. Your tiredness may have to do with other factors going on in your life.
God bless,
myangelsinheaven
