Originally Posted by
atomic sagebrush
There are two main reasons why e4d is better than one attempt for conception. First of all, in these unpredictable months, you will ALWAYS be in with one attempt in the fertile window regardless of when you O. Even in the "worst case" scenario of O-3 and O Day attempt, that is still one attempt because if there was anything left from the O-3 attempt, it would already have fertilized the egg before the O Day shot could capacitate and make it to the egg, and if there isn't, then the O Day shot will have a chance at it. you are guarded against both early and late ovulation, you're guarded against false positive OPK and false negative ones, plus it also helps keep your husband happier.
And the second reason is a little more hard to understand so please feel free to ask for clarity if you need it. But we don't KNOW that first positive OPK is going to be the best day to conceive with one attempt for you, or at least for you in any given month. Maybe the day before first pos is better. Maybe the day after. Maybe 2 days after. If we carry on forever always having the same day of attempt, if a different day is better for you (or would be better in any given month, this absolutely can vary) then you may go on and on having sex on a day that was never particularly ideal. So both in terms of ensuring you have an attempt even with early or late O, and adding this element of randomness so we don't get locked into just one day forever and ever in case that day wasn't ideal for you, it's much better for chances of conception. Even O-3 and O Day is not worse chances of conception than just one attempt, because there's so much unpredictability with OPK and sooo many people end up having one attempt only to O several days or a week later, just having regular attempts is going to boost your chances of conceiving.