Why??????

So why is it that the people who try to get pregnant it takes forever to actually get pregnant. Yet the people who aren’t trying to get pregnant. Seem to be pregnant at the snap of their fingers? I don’t mean this as an insult to anyone I just don’t understand it. I was talking with my boyfriend about it yesterday and it just amazes me to hear how some people try for years and never get pregnant while someone can get drunk one night have sex and two weeks later their pregnant. It’s so stupid. Sorry my rants over.