Hi,
Yes, in case of emergency, combined pills can be used as emergency
contraceptive pills. According to your description you used the pills as per the required dose. But usually
pregnancy is not likely on 7th day of the cycle in case of regular 28 to 30 days cycles.
Anyhow the bleeding you got on 17th day could be withdrawal bleeding due to the pills taken. Now usually you have to get the withdrawal bleeding after completing the pack. You can wait till one week after completing the pack to get the withdrawal bleeding. If you do not get the bleeding even after one week and if you want to continue the
contraception, please go for urine pregnancy test to rule out the pregnancy and start the new pack.
If you do not want to continue the pills - after doing urine pregnancy test, if the test is negative, wait till withdrawal bleeding comes like for one week to ten days. Meanwhile you can use some contraception like
barrier methods.
Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Sree Gouri S. R., OBGYN