Thanks for the query.
If you had unprotected intercourse
around the time of ovulation, then there is possibility of pregnancy
The irregularity in menstrual flow can be seen due to many causes like hormonal
imbalance, weight changes etc.
So you once go for urine pregnancy test, if that comes negative no need to worry.
Possibly your menstruation
can be normal soon.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429