Opioids are derivatives of morphine, a narcotic pain reliever. The term opioid generally refers to morphine and other opium poppy-based medications. Opioids work by decreasing pain signals being transmitted through the nervous system, which suppresses our perception of pain.
When you swallow semen, Semen and sperm go down into your stomach, where they are digested with all your other food. There is no passage connecting your stomach to your ovaries. You can not get pregnant from swallowing sperm. If the donor has no STDs, it is perfectly safe.
If you happen to have sex on the same day as you have ovulates, then you could get pregnant the same day. But if you don't ovulate the same day you have sex, sperm can live for up to three days (some day even longer!). So you can get pregnant 1,2 and even 3 days after you have sex. It all comes down to when you ovulate and if there are sperm hanging around or not! The egg only lives for about a day so it's not hanging around as long as the sperm are. Conception means the day the sperm fertilized the egg.