Well... it depends a bit, I've definitely had phases of eating 'crap', but I try and indulge those for a bit and then move on quickly.
First 11 weeks I ate whatever I could manage without feeling sick. Lots of jacket potatoes, potato waffles, and weirdly, apples and pineapple.
After that I did this for quite a long time - until about 20 weeks:
Breakfast: a really fibre filled cereal (all bran) with milk, then a banana and some dried apricots or apple. Yes, I was constipated, this was the only thing that worked.
Mid morning: an apple or two, or some pineapple with a couple of babybel cheeses.
Lunch: chicken salad with lots of different crunchy salad stuff (I wanted crunchy food), always mayonnaise, sometimes some egg or cheese in it too, always sweetcorn and red peppers for the sweetness. Followed by a yoghurt and some more fruit - usually berries.
Mid afternoon: hummous and carrots, crackers and hummous. Again with the crunchy.
Dinner: whatever vegetarian meal the boyfriend cooked (he's the cook in the house, and a veggie), but nearly always something with loads of salad, or loads of broccoli or loads of mange tout or peas. Then some dark chocolate for pudding.
I couldn't get enough of fruit and veg, which was amazing as when I'm not pregnant, I don't really like the texture of most fruits. I also had very little interest in things like cake, biscuits and chocolate - I did lent without anyone knowing I was pregnant, but with no issue at all because I didn't fancy those things! Cheating.
At around 20 weeks, the icecream craving kicked in - I wonder if I'd not been eating enough dairy or something, or maybe I just wanted the sugar. Whatever, I was eating three mini magnums a day, one after every meal! This went on with the above meal combo for about 3 weeks.
Then last week, the carb stuff kicked in big time. Pastry, bread, pasta, jacket potatoes, sandwiches, cake, cookies... along with full fat cappuchinos. Weird, because I never eat pastry normally, I find it gross and flabby. Beans on toast has been one of the best things ever... beans on jacket potato, anything on jacket potato.
I'm trying now to not eat loads of sugary things with this, and instead just go with the low GI carbs like brown pasta, whole jacket potatoes, granary bread etc. I'm assuming that this phase too will pass!