So I know it might sound a little skeptical - but I have tried this on all of my mum-to-be friends and it works 100% for us - so just want to take it further and see how accurate is this:
to predict the gender of your baby you take:
Mothers age at conception + the month of your missed period+ 3
If result is an even number - baby will be a girl
If result is an odd number - baby will be a boy
I was 21 when we conceived + 7(missed my period in July) + 3 = 31 - odd - boy - and we did have a boy the following March
Very interesting to see how you go !