Periods

sometimes it's better not to know....jk it really depends on the author, some make female alpha have a penis so no uterus no vagina no menstrual period, some make them have vagina still but can impregnate omega but not get pregnant, some have vagina can get pregnant can't impregnate and the only alpha trait they have is strong pheromones that make omega weak. also this is not even including dominant/recessive traits.

sometimes the author will explain how things work throughout the work and sometimes they expect you to understand (you see female alpha with a penis, you understand you don't have uterus so no pregnancy no period)

1) omegaverse follows estrous cycles (i.e., heats), which are different from menstruation cycles (i.e, periods). in real life for example, dogs and cats have estrous cycles, whereas humans and elephant shrews have menstruation cycles.
so there's a logical reason behind no periods being mentioned in omegaverse

2) some stories feature a character having male and female parents who are both alpha, so yes i'd think that an alpha female can still bear children even if they are also capable of fertilising eggs. but this depends on the author

3) this is just my guess, but alpha females and omega males probably don't have the anatomy/fertile cells/right variety of chromosomes to create viable offspring by themselves

That makes more sense when you put it that way, thanks

I still think authors should make it a little bit clearer because it just make the stories really messy