Single post in A Pokémon Breeder's Guide to the Daycare

Hello there :) Im new to the game and currently trying to get some eggs for the Dex to fill. I tend to get eggs from the male Pokemon instead of the female I need. Right now I'm doing ratata female with alolan male ratata and yesterday it was female dustox with any male bug. Isn't it usually the females you should get an egg from? Am I missing something? Thanks in advance :)