Hello dear
Understand your concern
Most common causes of delayed period is
pregnancy in your case as you had unprotective intercourse.
Pull out method is not protective as pre ejaculatory fluid can cause pregnancy.
So if period will delay by 8-10 days from normal expected period date then you have to go for pregnancy confirmation by home pregnancy kit with fresh urine sample in the morning.
If you do not want child then you should terminate by using mifepristone plus
misoprostol under the advice of gynecologist.
Other causes of delayed period in absence of pregnancy are:
hormonal imbalance, excessive stress, thyroid imbalance, change in dietary habit and lifestyle, ovarian dysfunction/
ovarian cyst.
Above cause should be evaluated by hormonal assay,
ovarian follicle study.
Avoid stress, do regular stretching and relaxation exercise, take healthy diet and fresh fruits.
Hope this may help you
Best regards
Dr. Sagar