also, get a blood test, see if you're anemic! tha is a symptom of enemia, which is even highr risk for preterm labor. if your nail beds are whitish, you look pale, dark under eyes, little appetite, and slow and tired, u could very well be anemic. i am! todays my first day of taking an iron supplement. should help!
Eat as much as you can handle, I'm 15w4d and I only eat once a day also. Just be sure to take your prenatals and drink plenty of water!