Someone Help!

I need ones advice and tips. I have a serious problem with spending. My fiancé has been on me constantly about spending money and just yesterday we had a huge blowout! I totally overspent and I'm totally disgusted about it. I'm an emotional spender and being pregnant doesn't help that much. He actually made it worse yesterday and after the blow out, I went and shopped more. I've been trying to cut back, but I can't seem to grasp it. He and I were supposed to make a purchase for something together and I don't know how to tell him that I spent my half. Does anyone have any suggestions or advice for going forward? Please help! I'm desperate!