When will my albino cherry barbs mate?! And my tetras?

I have 2 males and 2 females. One of the females I bought really fat so doesn't thA mean she's preggo? When wil they mate and have babies? WhT are som signs of mating and labor? Also I have the same ratio with reg cherry barbs. 2 male and 2 females. Do they have the same mating cycle as the albino cherry barbs? Would a cherry barb ever mate with a albino cherry barbs? Also will my tetras (gold or black or cardInal) ever mate( not with other species but in the SamE group?? Wat does thei mating look like? Would 2 female dwarf Gouramis go good with 1 male flaming dwarf gourami?