What is up with us thirty year olds getting BC?

I'm 36 years old. My story is a bit of a miracle if you ask me. At 35 I decided I needed a mammogram. They fought me on it because I wasn't 40 yet. I push and even told them it was my grandmother (it was actually my great grandmother) who had breast cancer. They finally relented and let me get the regular mammo. Well, right after I lost my job. They called me back for further studies of "calcifications" of one spot in my right breast but I never went. Skip to a year later, I got that feeling again. I need to follow up on this mammo. So I start the process again. Had to fight to get them to pay again. Get a Tommo done this time. Get called back again for more views and an ultrasound. This time on 2 spots. This then led to a biopsy and now I have a wonderful diagnosis of DCIS. HR/PR +. But looks like so far there is no tissue involvement but it is on the verge with papillary extensions. I have not received the results of my MRI yet to see if there is anything else there. I am scheduled to meet my PS today. I have heard so many stories lately of people going through this in their 30's. My gyno said that there was not one reason for me to have breast cancer. It's not close enough in my family for that to be the cause. (I have had the genetic testing but it hasn't come back yet)

How many of us recently diagnosed are in their 30's? And why now is this becoming such a common thing? I've decided because I'm so young I don't want to deal with this coming back. I'm getting a double mastectomy to lower the chances. How many of you have the same thought process? How many of you are considering a hysterectomy after this as well if you are HR/PR+? So many questions....