No withdrawal bleeding this soon after a Meprate course isn't unusual, but the unprotected intercourse on 2 October changes the picture here. Your test on 5 October was taken only 3 days after that encounter, which is far too early for any urine or home test to pick up a pregnancy.
Next Steps
Repeat a urine
pregnancy test around 2 to 3 weeks from 2 October, or sooner if your period still hasn't started by then. If that test is also negative and bleeding still hasn't started, please see your gynaecologist for a check and bloodwork before restarting any period-regulating medicine.
Health Tips
Don't repeat or adjust the Meprate course on your own until pregnancy is ruled out properly.