Alphas are generally dominant and able to impregnate Omegas. Male Alphas usually have aknotwhen aroused.
Betas are subordinate to Alphas and may or may not be able to impregnate Omegas; in some fanworks Betas aren't present and the trope is known as Alpha/Omega, in others they take the role and functions of Omegas and Omegas aren't present. Betas are often presented as having "normal" human anatomy with none of the special attributes of Alphas or Omegas.
Omegas are generally lowest on the hierarchy (although in some fanworks Omegas are rare and prized). Male Omegas are self-lubricating and have the ability to becomepregnant sometimes referred to as being bred or mated. Lovers may form pair-bonds with a special connection with telepathic or empathetic qualities. Paired Alphas may be jealous and possessive of their mate, while the Omega may become submissive. Omegas and Alphas may go intoheatand need to have sex; this may be the only time Omegas are fertile.
What is a heat?
A heat is the time when the Omega is most fertile and ready to mate, or just hide away until the heat is over. If they have an Alpha mate, they will never leave their side unless they need to get their Omega food or water. Mainly, they have sex and then rest. They keep a watchful eye over their Omega, listening to them and caring for them. But in bed, they still are the dominate ones. If an Omega has no mate, that could be dangerous to even leave the house. They could get raped and forced into all of this, even if they protest and try to run. So they basically lock themselves in a room and use many toys to get through this. A good part about this heat is that the Omega will self-lubricate, which means they only need to prep the Omega a bit more have sex. During these heats, the hormones in an Omega go all crazy. A strong scent is released during the heats, causing the Alphas to smell it and chase after the Omega. If there is already an Alpha with that Omega, they will fight the other Alphas off. Some public buildings have small rooms in their basements for any Omegas who suddenly fall into the heat and need help. In some verses, there are pills to stop the heats from happening and some verses have washes that help cover the scent up. There is a pad-like item for the male Omegas to help stop the leaking from the lubrication when they are in public.
How does pregnancy work?
Pregnancy is about the same as in the real world. For Betas at least. For the Omegas, everything sort of changes and flips their world around especially one who has never had a child before. The male Omegas chest will grow to around an a-cup to help feed their child. The Omegas will most likely be happy about having a child. The Alpha will become more and more protective of not just their Omega but also the small child growing inside of the Omega.
How does birth work?
For female Omegas and Betas, it works just as real life should. For male Omegas is where it gets complicated. Since their uterus is not in the normal position, there will most likely be a c-section, or Cesarean section. Basically they cut their body open and go into the womb, pulling the baby out that way. There are anesthetics that can be used to help numb the pain.
To anyone reading this I will update when I can, school is about to start for me so my schedule will be wacky.