Determining the gestational age by counting weeks is just an estimate as you wouldn't know when you exactly ovulated. When I was having my girl and went for my first scan, technically I was supposed to be 9 weeks but upon check, she was only at about 8 weeks. Which is why your gynae is saying to check back in 1-2 weeks time.
Don't give up on hope. Pray for strength. Don't stress yourself too much. ☺
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