CHINESE GENDER CHART!

So, I have 2 little boys; Bentlee (2) & Levii (1). Ive tried using the chinese gender chart before but found it was inaccurate. However, i just recently found out you have to go by your "lunar age". So ive found my lunar age for when I concieved both my boys & used the chart & they were both right! However, for this one, ive done the same & it says im having a girl & at 13 weeks I was told I was having another boy! Just for fun & other peoples experiences, have any of you used the chart & was it correct or incorrect?