Thanks for the query.
If you had unprotected intercourse
around the time of ovulation, there is possibility of pregnancy.
But menstrual irregularity can occur due to many causes like hormonal imbalance, lifestyle modifications, decreased hemoglobin
So you once go for pregnancy test.
If the test comes negative, possibly the menstrual flow will start soon.
If the test comes positive, consult gynecologist and go for ultrasound
to estimate the gestational age
Then according to the findings you can proceed further.