Thanks for the query.
If you had unprotected intercourse
around the time of ovulation and if your period is abnormal, like scanty flow or only spotting etc. then there is some possibility for pregnancy
But just by symptoms we cannot come to one conclusion regarding pregnancy.
So you once consult gynecologist, get examined to rule out the possibility of pregnancy.
And then check for hemoglobin
levels, blood sugar levels. If needed take the consultation of ENT doctor. By this possibly the cause for your problem can be made out.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429