Is it possible

to go in for your first ultrasound at 10 weeks but you end up being way less? Like 6-7 weeks? I don’t understand why my first pregnancy test came back negative when I was supposed to be about 4-5 weeks already maybe even further than that (I don’t remember the exact day I took my first one where I got my BFN) and I’m worried that I might not actually be very far along bc I’m getting an abdominal ultrasound not a vaginal and I’m pretty chubby so I’m worried they won’t be able to even see anything