Can someone help?!

A friend of mine found out she is pregnant, the doctors are telling her she's 6 weeks, what she told me is her last period started July 4th... I would think she's father along... She thinks she conceived on August 10th, but I think she's got if off completely, I'm trying to help her out, but if her last period was July 4th, she would have conceived in July, right??!!