<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi I have been on depo for approx 2 years. I am 9 days late for my injection and I have had unprotected sex with my partner last night. How long before I know if I am pregnant. I am also due to get my injection today if pregnant what will happen to the pregnancy  <response>: Hi, Chat Doctor. I welcome you to Chat Doctor VIRTUAL CLINIC. I have gone through your question, and I think I have understood your concern. Furthermore, I will suggest you the best possible treatment options. 1 First do not panic. If you are regularly on demo injections, then seven to ten days plus - minus will not affect your contraceptive effects of the demo shot. Also, return to fertility is not that instantly even if a woman stops taking demo shot.2 You need to wait for at least 2 weeks after unprotected sex to get the urine pregnancy test to show the results. 3 I will suggest you to take emergency contraceptive pill like I pill or Plan B within 24 to 72 hours of unprotected sex act. This will help to prevent the pregnancy. 4 Please do not take demo injection if you are not sure of the pregnancy condition. If taken in pregnant condition, it can have virilizing effect on the female fetus. I hope this answer helps you. Thanks. 