Should I be worried

In my first trimester I couldn't really eat because of sickness so I would only eat little things that I could keep down. At the beginning of my second trimester i was eating normal again. Love fruit, salad and hot wings. Not a real big vegetable eater so I'd drink things with vegetables in it.  Now I am 17w2d and I haven't been having an appetite lately. It's like only way I'll eat is if I force myself and even then it might be on or two bites out of something then I feel full. I definitely do not want to be hurting the baby cause of me not eating. If anybody has experience this how did you over come it ?