I have read your question,
with mere symptoms is not possible , and without physcial examination and medical history it is difficult to conclude anything here.
You did not mention anything about your period , Unprotected sex after 10th day and 17 th day are unsafe while others are safe.
Some Pre-Pregnancy symptoms include: Spotting or Light Bleeding,Delay/Difference in Menstruation
,Swollen/Tender Breasts,Fatigue/Tiredness** ,Nausea/Morning Sickness# ,Backaches ,Darkening of Areolas ,Frequent Urination
, Food Cravings or Food Aversions.
** Stress, exhaustion, depression
, common cold
or flu, or other illnesses can also leave you feeling tired or fatigued.
# Food poisoning, stress, change in hormonal birth control method or other stomach disorders can also cause you to feel queasy.
I suggest you to consult a gynecologist nearby for further advice and undergo and pregnancy test if necessary.
Wishing you a good health,