Pulling out before ejaculation plus taking the emergency pill the same night lowers the pregnancy risk a lot, though neither method is completely foolproof. A negative test just 3 days after the exposure is still early, since a home test usually needs more time to turn reliably positive if a pregnancy has started.
Next Steps
If your period hasn't started by 10th November, repeat the urine test 3 to 4 days after that date for a dependable result. The emergency pill commonly shifts your next period a few days earlier or later, which is normal.
Health Tips
Please see your gynaecologist if your period is delayed beyond a week past the due date, or if you notice unusual pain or bleeding.