I carried on working from when DC3 was 2 weeks old.
However I work for myself and mostly from home.
The pregnancy was not planned and as I was in a good place work wise, I felt that to take time off would set me back .
I had very good advice early on from my midwife that if I was to go ahead, especially with it being my third and DC1 and DC2 still being very young (aged 3 and 1) I had to get my plans in place and use my support network and if that included nursery from aged 3 or 4 months, then that was what I needed to do and not worry about other people judging me for it. Wise words!
My husband took 1 day off each week annual leave for the first 8 weeks and the Grandparents helped on a couple of other days, I also worked evenings where possible at first.
From 4 months DC3 had a a nursery place for 2 days a week and Grandparents helped for the other 2 days.
However, when DC3 was with Dad or Nana I could pop down for a cuddle or to say hello which made things easier emotionally.
On nursery days, I always picked up before 4pm so it never felt too bad. I was fortunate that I could pick work back up after bedtime.
We bottle fed during the day but I breastfed from 5pm to morning (mum guilt from feeding the other 2) so I didn't get any sleep either which was, as others have said, really not much fun trying to work the next day some days after being up 7 or 8 times through the night. Writing this I do wonder why I added that extra pressure on myself tbh.
I think if this is your first child as others have said above, you may feel very differently and find it hard. I chose to do this as it would be better in the long term to retain a flexible wfh role.
It is absolutely doable but make sure you are asking yourself what is the why?