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5w3d, gestational sac measuring 6.8mm

Caroline • Mon, Aug 07 • mama to Haley, born April 5, 2018 & Emily, born April 22, 2020 🎀

This was my ultrasound today and the nurse wasn't concerned at all about it measuring 2 days behind but obviously I worry. She said it measured around 6.8mm which puts me at 5w1d. We did IVF so it's not like I could've ovulated late or anything. Tiny yolk sac was visible as well which she said was a bonus and isn't always visible this early. Googling GS measurements for 5w3d it says average is 10mm so mine seems way below that. I'm so worried now. Next u/s isn't until next Tuesday.