Baby movements

At around 13 or 14 weeks I thought I felt the baby move, probably gas but haven't felt anything since. I'm almost 17 weeks. I'm so worried. I know first time moms take a while sometimes, and I'm also overweight. Ugh i just want to feel her, as reassurance that she's okay. I lay down and try to focus on movements lol but honestly I have no idea what I'm looking for.