Hello! I used sneak peek, but realised afterwards that the false "boy" positive is unfortunately rather high! It's so incredibly sensitive to picking up male DNA that the tiniest tiniest amount can produce that result; even if you've followed the results to the T, if a male had even walked past and brushed against a surface which you then brushed against, it can pick that up! Even amazingly- male animals. So in general, a girl result is pretty much definite, with a boy result, exercise caution. I ended up having a private 16 week scan to confirm it wasn't overly expensive and this is my last baby!