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1 This ultrasound can routinely detect a heartbeat in your baby as early as 6-7 weeks. 2  Confirming the correct dates of your pregnancy. 3  Some women are uncertain of their last menstrual period (LMP) or have irregular menstrual cycles, making it difficult for their doctor to correctly estimate when the baby is due.
In some cases a blighted ovum can be detected that early, but not with 100% accuracy -and by this I mean sometimes they tell you that the pregnancy is not viable and in fact it is. I honestly do not understand why they do ultrasounds this early except when ectopic pregnancy is suspected. I'm very sorry for your losses.