I've never been more worried for an appointment. I have my 12 week ultrasound on the 26th and I'm terrified there won't…

I've never been more worried for an appointment. I have my 12 week ultrasound on the 26th and I'm terrified there won't be a heartbeat. My doctor told me when I was at my 8 week that everything was perfect and not to worry and that my odds of miscarriage were very low.. I still can't help but worry that I'm that very small percent, though. I feel like miscarriage after 8 weeks is pretty uncommon but you never know. I was fine until a few days ago and now I'm psyching myself out again. Any other moms go through this after miscarriage? I feel like I won't be able to breathe until I know everything is good at 12 weeks. 😔