Ob-Gyn questions? Ask a gynecologist online.
Hello, I'm Ted Manos, MD, board certified obgyn. Convert with the twins. The most reassuring thing you texted was a normal nuchal translucency. The discrepancy in bpd is expected and a small bpd for the length of pregnancy is a problem but both twins bpd's are normal for 13 weeks. As far as sac shape, twin gestation might look irregular early on. Trust whatever your doctor is sharing. I've seen and managed many twin pregnancies and so far things are within an acceptable range.