There’s only one Catholic approved birth control method according to my Catholic education and it surprisingly isn’t not having sex (yeah not fucking your spouse from time to time is a sin, pressuring sex is a sin, but part of mutual marital duty is to have loving sex). It’s swimming in the Red Sea. Period sex is the official birth control method of the Catholic Church and the only one they approve of. Don’t want to do that or have kids, better hope you were called to a celibate order or the single laity.