That's how my second was. By heart rate my doctor said boy, during the ultrasound baby wouldn't uncross the legs so we couldn't get a definite answer, and low and behold, we had a girl. Thankfully with this baby he had his legs wide open for us. Dr. thought girl by heartbeat but ultrasound proved to be a boy, there is no mistaking. Good luck to you on getting a girl, but regardless, wish you all the best for a healthy baby!!
Same with me...she shook my belly till he moved!
That's the worst! They shook my belly and he went crazy. Got the full view!