Hello Doctor,

Am 25 years old, recently got married to a 27 years old guy.

we are not planning for a baby now, but we have participated in sex for 4 continuous days without any birth control precaution after the 4th day of period.
The next period is skipped(still waiting , 10 days passed for regular period), but the pregnancy test made with urine sample shown negative.

What might me reason for delay in period?
Is there any chance to become preganant now?
Is it necessary to take the preganancy test once again?