There’s a mentality within the “NFP world” that once you pick a method, you have to stick with it until you hit menopause.
But, the reality is that your body changes, just as the seasons do, and what method works for you during your first years as a newlywed may not work as well postpartum.
Of course, this isn’t to say that you will need to switch; ultimately, if you’re happy with your method and it’s working for you and your spouse, that’s what matters most!