probably - welcome to the thread, and sorry that you are going through this. I am not an expert on MRI, but if you are in the system to be seen regularly because of your family history, then it is possible they are having a good look at everything to establish what is your 'normal' (i.e. we all generally have little nodules and bumps which are nothing to worry about) but it will mean in future they can detect any differences that occur. Also some tests show some things well, but other things not so well. I think an ultrasound will just give them another view to look at, - breast tissue especially in a young woman like yourself, often needs a couple of goes to get all the angles and densities. Try not to panic 
angry feet - it is tense waiting, - so hang around for hand holding, I'm glad you feel more reassured about the two week thing, - that isn't something you should worry about.
Holsten - wibbles and tears perfectly natural - think of all you have been through in such a short space of time, you have coped remarkably well. Your new man sounds like a lovely chap, someone you can talk to. But don't feel cringy, there is no need really - we have all been through body changes to some degree, and it is hard and takes time to come to terms with. Is it something you could talk about in counselling, or to a MacMillan nurse perhaps?
topsy - grr to no call, hopefully you'll get one in the morning (if its too late now)
I haven't heard from my consultant today either.