Emma!! I missed this somehow! Blooming great news honey! Welcome to the club - I have four (insane but true!). Mine are 18, 11, 8 and 10 months old, so a big gap between the oldest and youngest, in fact the oldest looks after the youngest for his full time job!
You'll be great - one more doesn't make a lot of difference! Hee hee!
And at least you know where to come after if you have put anything on. Keep us posted on how it's all going!