Hello,
Welcome to ehealthforum and thanks for writing
Unprotected though carries a risk of pregnancy but chances of conception are more during the ovulation days(fertile days) which are 9 to 16 days in a regular 28 to 30 day cycle and the first day of the period is counted as day one. So first seven days of period are considerably safe.The possibility of pregnancy is less in your case.
A woman cannot have pregnancy symptoms so early.
Relax and wait for the next periods as missed period is the first indicative symptom of pregnancy. Other than that nausea,fatigue,breast tenderness,spotting,abdominal cramps etc might be present. Avoid stress as it can delay the cycles. Consider using protection during any contact.
Take care!