You may not be pregnant if you had unprotected intercourse
only during the dates mentioned as they fall in the safe period. Your symptoms could be pre-menstrual. You may wait for your period to set in and if it misses, go for a pregnancy
test with a fresh early morning sample of urine. For better confirmation, you may get a blood test
now and a trans-vaginal sonogram later. Hope this information is useful. Take care.