Heartbroken/need advice

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I had my first ultrasound today and they saw three sacs but no baby’s in them or anywhere else where they weren’t supposed to be. I’m supposed to be 8 weeks and 1 day today but one sac is measuring 5 weeks, 6 weeks and the other almost 7 weeks is it possible that there to small to see? Because there saying that there might not have been any babies to begin with