Yes, in theory it is possible for most women with clear symptoms. But in practice I’m very uncomfortable advising people to do that. Instead, I will tell you what I did with the disclaimer that, just because it worked for me doesn’t mean it will work for everyone.
I used the book Taking Charge of Your Fertility to learn the rules. It’s a great book. It teaches FAM rather than NFP. FAM is basically NFP but you are allowed to use condoms during fertile times. I just ignore the condom bit. Though the author does say there is risk involved in using condoms rather than abstinence.
I did have 2 meetings with an NFP instructor before marriage to check if I was interpreting things correctly. This set my mind at ease. She gave me slightly different rules to follow but they were pretty similar and I was able to use the details in the Taking Charge of Your Fertility book to put them in context.
As it stands, I am very conservative in phase 1 of my cycle due to my particular set of symptoms. I find my temperature is a very clear indicator and prefer to rely on that. If I had an instructor, or used ladycomp, I could likely add some more safe days in.
In my opinion it is never to early to start monitoring your symptoms, because you’ll learn a lot about your body. So many girls are so unaware of what their own body is doing! Also, trying to learn it 3 months before marriage is barely enough time to find patterns and understand your body. You could download the ovuview app and start tracking your symptoms now if you wanted
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