If you are three weeks pregnant with twins but the doctor saw only one heartbeat on ultrasound and your hcg was 3045 will other baby develop a eventually?

It is possible for one twin to have a lower heart rate than the other, or for one twin to be located behind the other, making it difficult to detect both heartbeats on an early ultrasound. It is also possible that one of the twins may not be viable, and may not develop further. Your doctor will likely recommend further monitoring to track the progress of the pregnancy and to determine if both twins are developing properly.