Sneak Peek and prior miscarriage

Callie

Just curious if anyone would know the answer to this question.

I miscarried at 9.5 weeks in November, don’t know the gender. Would it be possible for my blood to still contain XY chromosomes (if the lost baby was a boy) even if we’re having a girl this time? Our sneak peek results said boy but I just don’t feel I can trust it. I know our bodies retain aspects of the embryo in our bodies after miscarriage.