I would say keep it! I became unexpectedly pregnant at 22 and was dithering what to do, finally was sure to keep it, when I miscarried at almost 11wks. It was horrible and really drove home how much I wanted that baby. Perhaps think about how you would feel if the pregnancy ended unexpectedly (just as an exercise) to find your true feelings?
Whilst perhaps not totally ideal, I dont see anything wrong with your arrangements. I dont want to sound preachy or silly but at the time, my circumstances were totally not ideal - halfway through a degree, very very little savings, no boyfriend, living at home - and my heart still said keep it. I knew my mother and family would have been very supportive and that was a big factor in the decision. I had already begun planning for everything - a year out, a place in the uni nursery, etc.
I can only speak for myself obviously, but my miscarriage left me very sad, and it still upsets me even now. However, no one was aware of the pregnancy besides the father (who pushed for abortion) and I did everything - scans, and a d&c, all that - totally alone. So that made the experience worse.
At the end of the day, you have to go with your gut feeling. Whatever you decide is perfectly okay if it is the right choice for you x