I don’t think so either :( To make up for the rude answer the other person gave you, let me see what I could understand in this universe: I think the rules in this universe are that betas are kinda just regular humans, so beta males can impregnate beta females, for example, but a beta male cannot interact with alphas and omegas the same way.
An alpha male cannot get a beta male pregnant (like I’m big bro’s story) nor can the beta male get another male pregnant (like in ex wife's story) I think they can if it was an omega female maybe, but yeah. Betas are just humans basically, and human rules apply, I guess? Alphas and omegas fe the most most compatible, betas work with different parameters (maybe because of the pheromones thing?) I think that’s the rules the author went for in this universe.

How come omeagas in this series can't be impregnated by a beta? Has it ever been explained? Some omega×beta stories I've read it's possible, maybe it's the sperm?