I am due to return to work from Christmas vacation two weeks into January. I wish to return early, on the 3rd of January instead. I know this is an unusual request because most people would want more vacation time, not less. My difficulty lies with how much detail is appropriate to go into with my boss. The circumstances behind my request are personal and sensitive.
Background
I am an electrical engineer, so I don't work shifts. Generally my hours are 8-5 with some overtime.
I had a miscarriage earlier this month. It was very tough and, while I am slowly coming to terms with what has happened, I have found it very difficult to occupy myself during this time. I have taken up my hobbies and tried my best to keep myself occupied, however I find myself dreading the following two weeks of free time and looking forward to returning to work where my tasks for the day are highly structured and decided for me.
I love my job. I want to go back to work. However, I am also grieving. My employer doesn't know I was pregnant; I was in my first trimester still. I do not know how to approach this sensitive subject and the level of detail that is appropriate.
Question
Is it okay to tell him I had a miscarriage? Or would it be better to just ask to come back early and not explain why?
Edit: There is no logistical issue. The company is open from early January.
I have a great relationship with my boss and so wouldn't have a problem telling him if there's a logical reason to do so. I don't want to make things awkward. I don't know I this is appropriate to talk about in the workplace. I am not concerned about the consequences of him knowing I'm trying to start a family (perhaps I'm naive). I didn't think of the fact that he could assume something else if I don't give a reason at all.
Update (from comments, 2 Jan 2017):
Ultimately, I have decided that I'm not as fit to go back to work as I originally thought. While I want to go back to work, I also am still quite emotional and am unsure if I will be able to keep myself together. I probably could but I don't wish to complicate matters at work. My husband and I have decided the best action is to stay at home and allocate instead a largeish home project we will work on together which will occupy my time, allow us to work together as a team, and give me the space to grieve in private. Thank you all for your helpful insight.
Final Update (26 April 2017):
I ended up taking additional grieving time off earlier this year. I told my boss that there was a death in the family and I needed time to grieve and he was completely supportive.