obgyn doesn't seem concerned. (rant warning)

so I finally got an obgyn. I like her. kind of. you see if my family doctor could do everything I'd just go to him for everything because I trust him. and he knows my family and all the medical history. I mean I was like 4 when my family started going to him. but my obgyn said that because my braca (sp?), it's the rest to see of you carry the gene for breast cancer, came back saying I don't then I don't need to get a mammogram until I'm like 40. but my mom and grandma both tested negative for the breast cancer gene and yet they both got breast cancer and have passed. my grandma was around 46 when she was diagnosed and my mom was 35. the age of getting it gets lower and lower with every generation. but my obgyn said it's nothing to be concerned about. like wtf. this if my health and she won't even talk about it again. my family doctor is the one who diagnosed my mom. I'm tempted to just stay with him for all that stuff and if I have to see my obgyn i will. Sorry I just needed to rant