Just because male sperm are faster and I conceived straight away, does this mean it is definitely a boy?

[DetectivePotato]

I know that male sperm swim faster and die quicker whereas female sperm are slower and live longer so if you conceive straight away, does this mean it will definitely be a boy?

I know I conceived the one night I had unprotected sex. The dating scan put me at exactly 12 weeks pregnant which meant I conceived within 24 hours of having unprotected sex (was planned). I was convinced I was having a girl when I found out I was pregnant. People have been telling me it will probably be a boy as I conceived instantly, I am also having an almost identical pregnancy to that with DS and I am carrying the same, low and neat bump at the front.

I have my scan on Monday so I intend to find out but I really thought girl this time, now I am having doubts. Plus I know many people were convinced they knew the sex then were wrong.

I wouldn't have minded another boy at all. DS has been fab!

I just like to know that I am right, obviously.

85% doesn't sound conclusive. Was the baby not in a good position?

From friends' experiences, i think sonographers can never be AS sure when it's a girl for some reason, I guess because the clues for boys are more, er, obvious...

They never do say 100% for girls, do they?

Thanks for posting the links, and quoting the website's conclusions on it. I'd clearly got the myth in mind somehow for 70:30 but the actual figures quoted in the link don't show a single figure increase - it's much more.

I was particularly on the example of all boys in 4 child families; on 50:50, they predict 6.3% but the actual figure was 9.3% - that means roughly 50% more families had all-boys than expected.

Are the authors of that website connected to the original statisticians?

Sorry, hit post too soon: the actual likelihood of continuing to produce one sex would lie between the two figures, but my stars aren't up to calculating where it lies. Can any of the other posters who understand the maths give the approximate figure (I'd guess it would be somewhere a bit under the halfway point?)

And Detective: any news you're willing to share?

omimolap skip back a page. She's having a girl, or 15% chance of a boy. congrats :)

Another old wives tale shattered for me. I quite liked the idea of this one tbh.

I had 2 boys and then a girl and then another boy,each pregnancy was slighty different and so were the births..

85%,dont buy too much pink,a lady down our road,bought all pink,even had the cot engraved with the babys name,and it was a boy,what a shock for her,but my neighbour who had just had a little girl was well pleased as she got a lot of clothes from her..

My daughter is having a boy 100%,he opened his legs and flashed his willy about 6 times,so no doubt there,and she even gave her a scan pic of his willy lol.

Yes she is in a very awkward position. She wouldn't move (even though the sonographer got me to empty my bladder and jump up and down) and the scan was very difficult. He did say they never say 100% for girls but only for boys. I think he did get a pretty clear bit of between her legs though as he did show me. When we had DS there was no doubt either. That was 100%. I'm going to hold off on the clothes, just in case. I reckon he wouldn't have said anything if he didn't know though as he did have difficulty seeing her heart and stuff.