For those who have had "girl" harmony results

Jessica • 29 years old, in love, and married. Mommy to Lucy born in March 2016. I am complete.
When was your blood drawn? Did they say they can't be 100% sure? Mine was at 10+4 (as directed by my midwife) and they said it could be early enough that the "Y" wasn't concentrated enough to be picked up.  Was anyone else told this?? I think they said 90% likely to be a girl but a woman I work with had the same and it ended up being a boy.