No, taking an i-Pill about one hour before sex is not a reliable way to prevent pregnancy. The i-Pill contains levonorgestrel, which is an emergency contraceptive. It works mainly by delaying or stopping ovulation (release of a mature egg), which means it is intended to be taken after unprotected sex, not before it. When taken before sex, it does not provide ongoing protection for intercourse that happens later. Sperm can survive inside the body for several days, so if ovulation occurs during that time, pregnancy can still happen. The correct way to use the i-Pill is to take it as soon as possible after unprotected sex, ideally within 24 hours and up to 72 hours after, although its effectiveness reduces with time. It should not be used as a regular method of contraception because it is less reliable than routine options. If you are planning sexual activity, using a condom or a regular contraceptive method is a safer and more reliable option. If unprotected sex has already occurred, emergency contraception taken after that event is the correct approach.