Heart beats for twin gender?

Dennyiel • Married to my high school sweetheart ;) we have four beautiful children a boy and girl, and a new set of boy/girl twins! Had a chemical pregnancy in September 2015.anovulation problems
Okay so 13 weeks and went in for an appointment and both babies heart rates are 160bpm. I can't remember what my other children's were since it's been 9 years. What are the chances of heart rates determing genders? The wait is killing me only 5 weeks left. What do you ladies think? Boy's, girls, boy and girl! And here is a little picture of my babies