Hello dear Understand your concern Do not be panic. Chance of pregnancy is very less as you had done anal sex. Wait for the period to come. Excess stress can cause delay in the period. There is no successful home remedies to prepone the period or prevent the pregnancy. If your period will delay (7-10 days), you should confirm the pregnancy by urinary pregnancy kit. If it is positive you can abort by using abortion pill. But this medicine should be take after USG scan by the gynecologist. Mifeprsitone should be followed by the misoprostol under the guidance of gynecologist. Do not take at home as it causes serious complication that can not managed at home. Avoid stress, start relaxation and stretching exercise, take fruits like papaya, orange and pineapple, drink plenty of fluids Hope this may help you est regards Dr. Sagar