Hi there, Meg> I've only just seen this - welcome to the boards. It's a great commitment to put yourself first and get to a body that feels comfortable and is healthy.
Have you thought about adding in random acts of fitness. These could be walking up the stairs, not using the lifts or escalators, parking in the farthest corner of the carpark at the supermarket, getting off the bus a stop early, or walking a longer way round between a and b.
Anpother idea is to get a pedometer and challenge yourself to do 100 steps more a day than you average in the first week, until you get to 12,000.
Ali