Do you have thoughts on who will carry the children and/or stay home?
My DP and I were in a similar situation to you, although I'd always mentioned I had fairly substantial savings, and mine were not anything like as much as yours (though my DP had substantial debt, which made the discrepancy between us bigger).
Given you're both women, it money needs to figure into the calculation of who'll take the (likely) career hit and how it will work.
Just to give you a sense of how things stacked up for us - I paid for fertility treatment (which eats at savings); DP carried our DD and had a (short) maternity leave; then I took the career hit at home with DD. That wasn't planned, it was just how it worked out - but it would be very worth thinking what would happen to either of you if you found one of you couldn't go back to work (eg., after a very difficult/damaging pregnancy, or because your priorities radically shifted after DC were a reality).
Bear in mind that only one of you gets child benefit and the pension breaks.
Assuming you will both have parental responsibility, bear in mind that even if you are not married, if you live together in a house owned by you, your DP is likely to acquire some rights, and at the very least (obviously, one would hope!) you couldn't kick her out with the children if you suddenly found things went sour.
(I know it sounds horrible to think like this, but it's a worst case scenario.)
I would say, talk to your partner about what she expects from the relationship and for your future. Not 'what do you expect of my money' but 'what would you want to happen if I couldn't work for a year when the baby is born' or 'if I ended up a SAHM and stopped earning, how would you feel?'. Those sorts of questions. Hopefully those would give you more of a sense of what should happen with the money.