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Ok, I have charted for over 6 years and know I O on cd 18 every cycle. I have had over 17 losses and have 2 live children. My question is:
Since I have tried for so long and finally achieved my 2nd child, what are the odds if I just didn't have sex during that fertile week that I know I O?
I don't want to take bc but also don't want to get pregnant (really although I wouldn't be upset) right away (would prefer 2 yrs til ttc again, if I ttc again)[/b]
I'm so sorry for your losses.
As for simply avoiding the fertile week, that sounds like the Rhythm or Calendar Method. Since you're very regular, the odds are OK to pretty good that it will work - but even the most regular women are bound to ovulate earlier or later than usual once in awhile. Using your past cycles to predict fertility will not accommodate for that. Just because it hasn't happened in the last 6 years doesn't mean it never will happen (especially as you get older, your cycles can start to change).
You can avoid pregnancy with an effectiveness of 99% with a modern form of NFP - by evaluating your fertility day by day and avoiding sex on days of fertility. Whether it's a day of fertility or infertility is based on the evidence your body gives you and the rules of the NFP method of choice. Doing it this way accommodates early or late ovulation.
I guess it's simply a matter of sitting down with your DH and deciding how necessary it is to avoid pregnancy at this time. If "OK to pretty good" odds are acceptable, then using a Rhythm Method way of avoiding the fertile week is probably fine. If it's more necessary and you want the 99% effectiveness, I would consider a modern NFP method instead.