Hello dear I understand your concern Pregnancy is not possible by doing oral sex. If you had unprotected sexual intercourse in fertile period of cycle then pregnancy is possible. I advise you to undergo the home pregnancy kit (with fresh urine sample in the morning) to confirm the pregnancy. If test will come positive then consult the gynecologist to confirm the intrauterine pregnancy by USG scan. Intrauterine Pregnancy is terminated by the mifepristone and misoprostol under the advise and observation of gynecologist up to 9 week of pregnancy. Consultant process is confidential and no will know about the abortion. In absence of pregnancy other cause of delayed period like hormonal imbalance, ovarian cyst, endometriosis, excessive stress, thyroid dysfunction should be rule out by proper investigations like reproductive and thyroid hormone analysis, Ovarian follicle study. In absence of pregnancy, period can be induced by progesterone pill/injection. Avoid stress, take healthy diet and do regular exercise Hope this may help you Let me know if you have further question Best regards DR, SAGAR