Cherished - don't beat yourself up. Would it make it easier if you made up a meal plan for each week, so you know you've got a good mix of healthy foods? A great book I've found is called "Feeding the Bump" by Lisa Neal. It details all the nutrients mum & bub need for each trimester and includes recipes. DH & I both love the Bircher Muesli. It helps with planning meals, especially breakfast, which I'm useless at generally.

It's OK to indulge once in a while, but make sure you're having enough protein and loads of green vegies.