I did do NFP before, I guess with everyone chirping in my ear I’m just afraid it’s not as effective
Oh my goodness no! If I were you I'd read up, get some data, and look into success rates from reliable sources. Marquette University has lots of good info. NFP can be 91-99% effective when used correctly (roughly the same as condoms).
As for a spiritual layperson perspective, the devil comes to lie and accuse and incite fear. Don't let that fear keep you from doing what's right, and in all cases of course, talk to your priest for advice!
I would speak with your priest. Birth control is allowed for medical reasons and high risk of dying from another pregnancy seems like a medical reason to me.
NFP! I use the Marquette method, but there's several.