I guess we underestimated what it would take to do Uni, whist having a family. I told him I would go back full time, again dead against it. He reckons child care would kill us $160 per day for 2 kids, not to mention I would feel like I had done wrong by my kids I get so stressed about this kind of stuff...being pregnant doesn't help the emotions ;(
So, he's telling you how you will feel? Not letting you have a say. He's just saying no, I am doing this, working full time and studying part time, you are not allowed to go full time as you will regret it.

Woo. No option to do full-time/two jobs until the baby is here then drop down again?

I worked full-time. Do I regret this? Hell no. I fed my son. He was loved and cared for by other people, but it's great that other people love him and care for him. I kept a roof over his head and food on the table. That is far more important than staying in a cold house because we can't afford to run the heating, not eating lunch in the week and worrying that we can't even afford clothes for when he grows.

Yes, you can regret things. But doing your best by your children, even if it isn't what you initially wanted to be for the best? No. And don't let anyone else ever tell you what you will feel. Not even me. I just wanted to offer another perspective.