If you had any history of the intercourse during the period of ovulation, there is possibility for pregnancy
But as you told it is early to comment about the pregnancy.
You wait for one more week and repeat the test.
If the test comes positive you can proceed further with your doctor's advice.
If the test Comes negative once check for the serum prolactin
levels with your doctor's advice.
Because hyperproactinemia can lead to irregular periods
and also milk secretion from the breasts in non pregnant women.