No bump from behind

EC
I'm 28 weeks pregnant and don't know the sex of my baby. A coworker commented today on the fact that from behind you can't even tell I'm pregnant. Isn't the wives tale that if you carry in the front it's a boy?
I started to have this conversation with her, but she's the ultrasound tech that did my anatomy scan and thus knows the sex, so I quickly realized we needed to change the subject.