Worried

Hi ladies ,, I'm quite worried ..I'm 5 weeks 2 days pregnant ..went for a check up today ,, Ultra sound and transvaginal to see the sac but the doc said she cudnt see much and wasn't clear ,, she booked me with a radiologist as her scan is 2d and said that the radiologist has the 4d scan..anyway I'm worried and not sure If this is normal at this stage ? Could it be ectopic ? I have no ectopic symptoms :s