I am 28 years old this is my 1st pregnancy.my last period was on January 8th, but I get 2 urine hcg test that were negative till the end of feb, but then I took blood test done tgat was positive.on march 20th doctor took an ultrasound and told its 6 week of pregnancy ,then after 2 weeks again took an ultrasound and doctor told uterus is good and sac is also good but no embryo seen and told me wait for another 10 days and take anthor u/s done . I'm worried whether to wait or not what to do please suggest