Stressed

Anyone pregnant feel baby move all day but still stress that something maybe wrong? I stressed my whole pregnancy about something being wrong hopefully im not the only one. Something wrong as in baby not growing right. Or because baby looks different in ultrasound photos. Low birth weight or you have a feeling baby will be sick when born. Because i dont feel as big as i did with my first and second pregnancy. Ive talked to my obgyn but he tells me everything is fine every pregnant woman feels this way. That i shouldn't worry unless i dont geel baby move. I go for an appointment tomorrow as i only have 32 days left. And kinda want to ask for another ultrasound but scared my doctor will say its unnecessary