So, I had my first ultrasound today. I'm supposed to be 7 weeks and 2 days today. They did the ultrasound but we didn't get a heartbeat. But my doctor said according to the measurements of the sack I'm 5 weeks pregnant that's why we didn't  hear a heartbeat yet. They're not going by my last period. So, I'm really confused. Has this happen to anyone else. ? And I have a big belly too or I'm just fat 🤷🏻‍♀️