It doesn't look good. If you conceived on Feb. 15th, the estimated date of arrival (at 40 weeks) is November 22nd (or somewhere around there). If she was 38 out of 40 weeks then she probably conceived about a month after that - so sometime around the middle of March.
I sure hope you get the answer you are looking for, but my guess is (based on the info that you provided), is that she is not your little girl... sorry.