So confused

So last week I went in for an ultrasound and I told the tech I was planning a gender reveal party and if she couldn't quite tell then its okay we can wait longer well she said she knew right away and my mom was with me and could tell too, fast forward to this past Saturday we do the reveal and find out its a little girl!! Well I needed an ultrasound done today and now they're saying it could possibly be a boy!! Im so confused!! Could anyone help a momma out??!