Mad at my doctor, opinions please!!

Tiffany • This is my 3rd pregnancy, hopefully first baby! :) I have suffered two miscarriages February 2014 & February 2015. I am due February 18th this time and I think my angel babies are watching over us ☺
I went and got an early ultrasound and heard the heartbeat!! ☺ this is my 3rd pregnancy and first time I have ever heard a heart beat. It was a strong 136bpm I was supposed to be 6 weeks 6 days but I measured 6 weeks 4 days.. she said 136 isn't where I should be and to just know it's slow.... what were some of your heart beats!? I feel like she took away from an amazing moment and I'm worried all over again. Thank you ladies, you all have been so great!