Am I really "not normal"?!

Here's the story: I have a 2 year old who goes to nursery while I am at work and pregnant again.
I start my day at 6 am leave the house at 7- start work at 9 til 5.30 pm
And get back to the house after 7 pm
5 days a week!
I am planning on returning to work after baby is born and initially do part time but within 1 year return to full time.
I am being looked at Mrs Mission Impossible and was told recently that this is not normal! You don't work unless you have to!
Now if I'd stay home and not pay for childcare I'd be financially better off- but I have a career and I am only 30. I can't sit at home for the rest of my life.
Mamas- please tell me you are doing such - is absolutely normal to work and have children!!!
No one said is easy but this is life...