Dual marker is normal ,then no more test needed,just do NT scan

You've to get beta hcg repeated at t+2 days to see the doubling time. Any history of previous abortion? Why have you done beta hcg at 12wks? Proper history is important for further management. You can consult me at my clinic GRG healthcare at Cottage no. 9, West Patel Nagar, Delhi, or call eight three eight three eight double two four eight seven for appointment.

Recheck bhcg values At 12 weeks this is too low a value

It is not possible. there might be typing error from the lab side. If the Beta HCG is 1142, pregnancy cannot be visualised by ultrasound.