A non-correlative sonogram like this can happen when the periods are irregular, the dates have been wrong or when the embryo fails to grow. A repeat sonogram preferably in the trans-vaginal route should clarify things. You can cross-check with serial serum beta-hCG
titres. Doubling titres on alternate days along with growth on sonogram go in favor of a good progress of the pregnancy
. You may take folic acid
supplements, avoid intercourse, take as much bed rest
as possible and please remember stress
should always be avoided in pregnancy as this is the most damaging factor of all. Wish you good health.