Hi My wife is pregnamt and her last LMP was

Patient: Hi. My wife is pregnamt and her last LMP was 3rd January 2015. On 19 February doctor suggested an ultrasound . In ultrasound the doctor confirmed that she is pregnant bt couldn’t detect any fetus. In his report he mentioned Gest sec to be 24mm and 6 weeks 6 days pregnancy bt no foetus detected . He suggested another ultrasound after 2 weeks. I want to know is there any chance that fetus could be detected after two weeks or not

Doctor: