Ttc baby no.5

[Hardhaton]

Hi
I've not been on for a long time but now I would like some advice.
I have 4 boys 12, 7,5 and 3. Hubs has asked if we should have no.5 baby.
Ok so I'm only 30, but after 4 over 8lb boys my body is slightly knackered.
I'm not sure how to feel about this, 4 is really hard work and I'm not sure if adding a fifth is a good idea but there is that part of me whom would really want a girl.
Although I shouldn't worry about what people will say I can hear the "she's only having this one cos she wants a girl".
My husband is self employed and we make ok money.
Any opinion is gratefully received but please be gentle