Hi everyone, I'm only 7 weeks along (pregnant), my stomach hurts const…

Hi everyone, I'm only 7 weeks along (pregnant), my stomach hurts constantly — sometimes strong cramps, sometimes just a pulling ache. The ultrasound is all good, tests are too, the doctor says it's normal. Has anyone experienced this? Sometimes I'm really scared — what if something's wrong? Should I call an ambulance for severe pain?