E.M.
You can save yourself some money and look up on the Chinese gender calendar just search it on the internet, make sure that you get a sight that will take into account your "lunar" age because that is what it is based on. our ultra sound tech said it has never been wrong in the 25 years she has been doing ultrasounds.
http://www.chinesefortunecalendar.com/PredictSex.htm