Can I trust this sex determination?

I got an elective ultrasound at 15w 4d since my and so won't be together at anatomy scan and the tech very confidently said girl! The picture I was given isn't super clear but I saw the three white lines in other pictures, even though baby was being a litttllee uncooperative. Also, the tech does specialize in telling gender. Is all of that enough to trust it? 

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