Ultrasound??

Corrine 🌸
So at the start of the week my dr did blood tests and said according to my hcg levels I'm around 4-5 weeks so he booked an ultrasound for me the next day (yesterday) being a high risk pregnancy and they couldn't see anything on the ultrasound , the lady said I'm too early then. 
My dr called me in today said to me that I must be earlier so he wants me to do another blood test in 3 days to check my levels again make sure they are rising. 
Anyone else had this problem ? I'm so nervous !!! I had a miscarriage back in March with twins , so everything worries me now