Thanks for the query.
According to your history the possibility of pregnancy
But sometimes preejaculate fluid can contain few spermatoza.
If you were around the period of the ovulation at the time of the act, there is some possibility for pregnancy.
Delay in periods can occur due to many causes.
So, you wait for one more week.
Possibly by that time you will get periods.
If not, repeat the urine pregnancy test.
If the test shows negative result, consult gynecologist and take tablets to induce withdrawal bleeding.