YES YOU CAN! (Sorry, I couldn’t resist. )
Seriously though, you can go forward with great confidence in this.
Another poster was right to say that many might lecture about proper use (which is actually more objective and useful information) or valid reasons (this is where private discernment of the couple is key).
Here I am about to make another gross generalization, but I will say this is true with me and my wife, and about 90% of the couples we know who use NFP: ** the beauty of NFP is that one’s ability to abstain during the fertile period is directly proportional to the seriousness of their reason to avoid pregnancy.** I believe there are VERY FEW people who actually use NFP for unjust reasons on the basis of this fact. As the seriousness of the reason diminishes, so will the desire to abstain in that time. The people I know who have unjust reasons to avoid will generally resort to contraception…not rely on NFP.