 [ Symptoms ] i conceived twice with 2 years gap and miscarried due to blighted ovum how to avoid in future tohave healthy pregnancy i conceived two years back in 2011 and had spontaneous miscarriage due to blighted ovum i got conceived recently with twin pregnancy and both were blighted ovums i had medical abortion to clean it up may i know why this is happening again and again and what should do before trying to conceive again please let us know [ Disease ] ultrasounds help health professionals estimate weight but it is impossible to be precise with weight until the baby is born your healthcare provider will measure baby is growth in a variety of ways to make sure everything is on track and should alert you if it is not for example they will measure the size of the head and the length of the bones on ultrasounds monitor your weight and size it is best to address growth concerns with your doctor who is following your case closely see this article for more details of growth during the second trimester of pregnancy congrats on your pregnancy