It's normal po ba during my first trimester na pumayat???

Hello po I ask something lg mga mommies I'm already 13 weeks pregnant na and napapansin ko starting last week nawawalan ako ng gana kumain and because of that pumapayat po ako ngayon... Nawoworry ako baka it can has be affected to my baby any tips po or ano pong magandang gawin in this case? Thankss!