(Closed) Confusion about ovulation and ‘safe days’

posted 7 years ago in TTC
Post # 3
Member
5 posts
Newbee
  • Wedding: June 2011

I didn’t read TCOYF, but I took a class on Natural Family Planning through the Catholic church. 

From my own experience, I believe you must wait that long to make sure the temp shift is a true shift and not just one high temp.  Just this cycle, I had my temperatures go up for two days, then plummet back down.  Waiting 3 days is just to make 100% sure you’re safe.

Post # 5
Member
4336 posts
Honey bee
  • Wedding: October 2011

I think there’s a couple reasons… You could ovulate like a day after your temp shift, the egg can live up to 24 hours, and you could possibly (rarely!) have a double ovulation, where another egg is released 24 hours later.

So…the rule is just to be extremely safe. Obviously, if it’s not essential that you avoid pregnancy, then by all means! Feel free to bend the rules (and let us know how it goes! 😉 I’m kind of curious about some of those rules myself, haha!)

I can’t find anything online like it right now at the moment, but I saw a chart once that was pretty interesting:
It basically showed how about 5 days before O you have a 10% chance of getting pregnant, 4 days a 15% chance, 2 days, a 50% chance, the day of a 75% chance, the day after a 20% chance, and 2 days after a 1% chance. (I made up some of those numbers, but you get an idea of the severity of the curve.) So, if you’re willing to take the risks associated with the percentage of, then go ahead and bend the rules. 

The rules in TCOYF (and similar methods) if followed correctly, are there to help you find when there is a 0% chance of getting pregnant.

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