Natural family planning

Hi! I am pregnant with my husband's and my second child (due in December!). We are considering doing natural family planning because, honestly, I just don't want to pump my body with hormones. I did have an IUD before our first child and did not have any adverse effects from it. I would actually recommend it. However, I don't really want to do that again. So, after some discussion, we have decided to highly consider natural family planning.

I am now looking for resources educate myself more on pros and cons of natural family planning versus more common methods.

Thank you!

Picture of my snuggly kitty for attention 👀