Eat what you can and when you're hungry, but don't stress just yet.
The food aversions should mostly go away around 14 weeks (give or take) and then you can start to get more focused on your food. For now water and pre-natals are the most important. Little bubs are designed to take what they need from you, that's why you feel so awful, your body is making miracles!
I know people who lost tons of weight in the first tri due to sickness and food aversion, but by the end had gained 40 pds and had healthy, smart babies.
I was so worried because all I could really tolerate was bean burritos (home-made) and bagels with cream cheese. I tried everything and most of it came back up or made me feel really sick. So I understand! But if you boil some pinto beans with salt, throw them into a flour tortilla, heck, throw in some sour cream, voila! Protein, calcium, carbs. Not bad, right?
I also made smoothies from frozen fruit with some almond milk, but most of the time it gave me bad acid reflux. When the nausea went away, though, they were great because you can sip them and get lots of good nutrition. Sneak some spinach in there, too, you will barely taste it