Was your 15-16 week elective gender u/s accurate?💗💙💗💙

My husband and I are going tomorrow for an early gender scan (to a reputable place!) where they will check in 2D & 3D, and I see stories here and there of people getting the wrong gender prediction. The place we are going does bring you back for free if they are unsure or baby isn't cooperating. My sister in law's doctor does her patients gender scan at 15w, so it can't be that horribly inaccurate I assume. Just trying to grab some reassurance, I get nervous and would hate to get all excited & have it be wrong :)