Hi Mambo,
i am in your bb group, and i had the same thoughts when i found out i was preg with DS3.
I have a 2y 4m gap between DS1 & DS2. I thought it was ok.
Then i fell pg with DS3, only 8 months after DS2 was born and i was FREAKING! I thought along the same lines as you, BUT they are getting along alot better than the eldest 2 and they are into the same type of thing, etc. Adjusting with a new child is always hard, no matter how much of a age gap, but you soon get organised and into a routine. I think it took me a few months to get into a routine. But when you have done it its great!!

Enjoy your pregnancy and i am glad i will be sharing the journey with you!