4weeks 4days

Hey so I went to the er thinking I had a uti after labs were taken the doctor congratulated me and told me I was pregnant according to my last period I'm 4 weeks 4 days I had an ultrasound done both abdominal and transvaginal they didn't see anything I was told my hcg level was 62 that mean I haven't been pregnant long so to come in next week to make sure everything doubles I was prescribed prenatal multivitamins any first time advice? What should I do next and should I be worried?