Complete loss of symptoms at 7.5 weeks , miscarriage?

I was feeling absolutely horrible once I hit 7 weeks and then a few days later mid day I suddenly felt completely fine. No nausea or severe fatigue, still a little bit but I have two toddlers so I’m always a little tired. I will be 8 weeks tomorrow and scheduled an elective ultrasound and called into my OB and am waiting for them to put in order for bloodwork. They want to check my levels and see if the pregnancy is progressing and I’m where I need to be. With my other two babies I wasn’t overly sick but this was so sudden it’s really scaring me. Thought I felt slight nausea a few times but might be in my head. Should I be preparing myself? Thanks!