From what I see of my friends and family who has a mother working fulltime outside of the home, is that the kids ages 12 and under, miss out and are don't get everything that is needed. I feel a mother needs to choose to raise her family and then once they are a bit older can then work outside of the home. Having children is a choice (don't give me any excuses), if you want one then you should parent fulltime. If you want to parent part-time - get a puppy. If you want it all, then get it all before you have kids.
Can it be done - absolutely - I had my career, save $ and bought a home, got married and then chose to have kids. It's full time to me. Kids are too important to be placed in someone elses hands to raise.
Freak out - go ahead - it's MY opinion. I'm not Judging you.