Sneak Peek DNA test help

Laura • Mommy of 5! (Girl 2011, Boy 2013, Boy 2015, Boy 2017, Girl 2019)

In the website, it says the test can determine gender at 9 weeks

Based on my LMP, I am already 9 weeks...

But based on my last ultrasound, I’m measuring 8 weeks 4 days.

Which time frame should i use to determine when to take the test??