13 weeks and 5 days

I'm feeling flutter in the lower left side of my stomach, it's a sensation I've never felt before, do you think I'm just crazy or could it be the baby? It doesn't feel like gas bubbles or anything like that. I'm underweight and have a small frame as well, I haven't been gaining weight I've been losing weight, but I'm taking a something to help me keep water and food down. I am showing like crazy, depending on the time of the day, you can tell I'm pregnant. 💓 please dont be mean. Anyways this side of stomach is also hard then the other side if that makes sense. I can't feel from the outside only if my the inside of me, I know my baby is very very active as well, when they tired to get a picture during the ultrasound the baby wouldn't stay still long enough.