Oh gosh I'm so sorry, this has been open at the top of my browser all this time and I didn't even realize it was there! You guys, please always feel free to bump your posts if I don't respond in a reasonable time.
I want you to take a moment and think about these things in terms of percentages. Because none of us can really be 100% set for a boy or a girl - the whole human race would have died out a long time ago if that was the case - there clearly is a huge element of luck that comes into play. In our results, the highest success rates we've ever gotten is about 80%, both pink and blue have had brief periods of time where the success rates got up that high, but it was unsustainable (sustainable results are more in the 70% range and I aim at 75.). I have never promised anyone 100% success rate with swaying, in fact quite the opposite.
So let's call 80% the hypothetical best we can do with swaying. This is the most anyone can ever be "set" for a particular gender. Now, imagine that instead of dry old percentages, you have a bowl of M and Ms where 80 of them are blue, and 20 are pink. It is entirely, absolutely possible for a person to randomly take 3 M and M's from the jar and get all pink, even with the absolutely highest success rate we can get.
Let's say that you are a person who is naturally very pink friendly. You start off 80% likely to have a girl, and with lifestyle factors/swaying, you got a 20% boost on those numbers. (And a 20% sway is HUGE! That is not just a small % point, that is a massive amount of difference) Now there are 60 pink and 40 blue candies to choose from. You've had a great sway but still may be somewhat more likely to have a girl. It doesn't mean swaying didn't work - it did work, it just wasn't a magic guarantee. But if luck is on your side you could still get a boy.
And then with swaying you got yourself to 50-50 - you could still absolutely get a girl after swaying for a boy - but you STILL had a good sway. Even with 60% blue, 40% pink, (a person who goes from 80% pink friendly to 60% blue friendly would have triumphant, amazing sway, but swaying just isn't a guarantee) you could still get a girl. It sucks, but it's just the way the luck of it all works. - even with a great sway, there's still a chance. Heck, I know a lady who did Microsort back when it was legal in the US, and she got a boy with 92% X sperm. Just think of taking those M and M's from a cup and you'll see what I mean - it is always possible to grab the "wrong" color.
What we're trying to do with swaying is IMPROVE the odds. Your husband is right, if you just kept having kids forever you would most likely get your desired gender. But most of us don't WANT to keep trying forever. Most of us have room in our families only for one or two more kids, and so we want to go in with the most "right" M and M's in our bowl to pick from. It can easily be that the cards don't fall our way, but still we want to be in with our best chance we can possibly get.
Since 2011, the first year of this site, we have gotten an average success rate of 70% for both pink and blue swayers. The chances that that would happen randomly are astronomical - I have an essay explaining that here:
https://atomicsagebrush.com/2019/03/...ndom-thoughts/ So while it's not as reliable as a study, if we really were just "lucking" our way into people getting babies of a certain gender, we should see some years where our results were only 50-50 and we just don't see that. We see about the same success rate year after year.
Have you found out gender yet??