Terrified of missed miscarriage

Im 24 and have had 2 healthy babies prior to this pregnancy. Never miscarried or anything. Im 7 weeks 4 days. I go in for an US tomorrow afternoon. Im so scared that maybe something will be wrong. Everyone i know has had a miscarriage at some point and im like oh no is this the time? I have plenty of symptoms like nausea sore boobies, frequent peeing, bloating. But i read that you can still have symptoms of pregnancy even if the fetus stops developing. I havent bled at all, i really have no reason to even think ill have a miscarriage but im still terrified! This was a surprise baby for us, i actually signed my tubal ligation papers two days before we found out. Now im in board and okay with being pregnant and it would just be cruel to take it away after the emotional roller coaster I’ve had. Any tips to not worry?