Dear Practo User,
Coitus interruptus is a contraceptive method with high failure rate ranging from 4-5 /100 to 15-28/100 .
So, there do exist a chance of pregnancy as it was 9th day of your cycle. I would have recommended you to use morning after pill/I-PILL but that is effective if taken within 72hrs.
Next Steps
Wait and Watch ,if your cycles are delayed , revert back.