How Accurate is the BOY SNEAK PEEK DNA test??

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We got results BOY! Last week and I’m kinda skeptical to belive the results until I see a wee-wee on a scan lol! Even tho we do have 6 Boys already I know what are the odd right?! But still in the back of my mind what if ?? Is there lol my husband also hopes I some how contaminated the results lol also I did some research and ppl say that sneak peek is actually 60-70% accurate not 99.5% Like they claim !