Thanks for writing to us.
Since you have had periods once after having an unprotected sex, the chances of pregnancy
are almost nil. It is more likely to be due to a hormonal
imbalance or the stress
in your life which considerably affects the cycle length.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Rakhi-Tayal