There would be a delivery service for pregnant women so that if all you wanted at 9pm on a Friday night was a big crisp watermelon and a glass of apple juice, you could get it. Or if you ran out of E45 and your dry skin was driving you insane you could get some, without getting dressed or leaving the house.
Maternity pay would be your full wage for 4 years.
Everyone would be taught in school to have unending respect for a pregnant woman and the trials she goes through to keep the population going, and how you should not barge past her in Sainsbury's or on the tube.
There would be free mattresses given out by midwives with bump and boob valleys carved into the foam so you could lie on your front.
All employers would offer 5 duvet days, so you could choose to stay in bed when you just really couldn't be arsed to get up.
And finally, SOMEONE, SOMEWHERE would have invented SOMETHING to stop stretch marks.