Should I be worried?

I'm 8 weeks and a couple days today and I've noticed for the last day or 2 that some pregnancy symptoms aren't as severe as they were in the beginning. Granted this is my 4th pregnancy could that mean my body has adapted faster or a possible miscarriage? I still feel very tired, pee a lot, occasional nausea and bloated but my boobs aren't as tender to the touch anymore. With my second and third pregnancy I don't remember having sore boobs at all as bad as I did with this one and my first pregnancy. I go in for my first appointment and ultrasound tomorrow but I'm terrified it's going to be bad news. Could this be a sign of missed miscarriage or am I just overthinking it?