I don't think many will flat-out ask you about it.. but every T is different, I guess! Ex-T never questioned me about any abuse, we just worked with other issues (I have a lot to choose from, unfortunately

) for several sessions. After we danced around those current issues for a while and built up a bit of trust, I took a leap of faith and wrote down a lot of information about my history to give to her. I knew there was no way I could bring it up in conversation - and I'd probably have resisted had she questioned me and put me on the spot - so writing seemed like the best (initial) option at the time to get it out in the open. Once she read it, she thanked me for opening up, and said that I'd confirmed a lot of her suspicions/what she'd been wondering about..
Given that experience, I'd imagine your T may well be wondering if anything has happened to you, but I think it's important to a lot of them that you initiate the conversation on that topic and take the lead - as MKAC said, they don't want to re-traumatize you or push you so hard you clam up on them.
Be brave, mswinter! I know you can do it, I'm sure of it!

The others have given you some great ideas of how to approach the subject, but if that's too hard, perhaps you could write it down like I did?! Let us know how it goes!