Measuring 10 days small

I am supposed to be 7w3days with baby #3. I am pretty certain on my last period date. Ovulation could be a bit off since I am still breastfeeding. At my first ultrasound my baby only measured 6w0days. They could see heartbeat but they are worried it is measuring too small to be viable....but still possible. Anyone have this happen and have it be ok?

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