am I still pregnant?

had a urinalysis and ultrasound at 7 1/2 weeks which confirmed we were expecting and all was on track, and have been dealing with symptoms of morning sickness, vomiting most mornings, food aversions and sore boobs, but I cant help but be worried/nervous that I might not really be pregnant! is this normal? next scan is not for another 2 weeks but without feeling a baby in there or any visible physical evidence, I can't shake this fear. someone please help make me feel normal again.