I have been eating as necessary. Trying to take in more veggies and fruits. I wasn't so concerned about increasing calories but more so cutting out sugars, greasy fats, etc... I would take into consideration what your current weight and body type is. I eat so I don't dry heave or throw up...
I pretty much eat the same, or maybe just a little bit more, as I did before for now. I usually eat fairly healthy anyways, but I have been more conscious about making sure I get more fruits/veggies. Today, I snacked on quaker oatmeal squares when I felt nauseated - and that symptom just started today - ugh. I feel like I have already gained a lot of weight even though I am only 6 weeks along - I was between 115-120lbs when I got pregnant so maybe the small amount of weight I gained seems like more, who knows. But, I do know that some of my pairs of underwear and pants used to be loose and now they're tight - haha.