I used to think this theory was probably right, but then figured it couldn't be or Chinese people would only dtd at the time to ensure having a boy! And I'm pretty sure nature still works out as half boys half girls there

So for my dd1 we were dtd regularly including up to "O" day and had a girl.
This time it was impromptu unprotected dtd on the "O" day and they think its another girl! (Baby in awkward position at 20week scan).
So I'm not really convinced in the theory now. I was sure they would say boy at the scan because of conception on "O" day! x