The result was that I had very little time for work throughout the week, what with my other, part-time job as an after school nanny. Most of those who work at home have had this experience at least once: Sometimes life piles up and gets in the way of us getting any significant amount of work done.
There are, of course, ways to minimize the damage when things like this happen. Working in the evenings isn't always ideal, especially if you have a family and try to limit your work to regular business hours. (Others who work at home actually prefer working odd hours, such as in the middle of the night, as they find they are more awake or less likely to be disturbed. I say to go with what works for you!) But if you have too many things to do during the day, you can often make up for it by playing catch-up in the evenings or on weekends.
If you find yourself running out of time, be sure to make the most of what you have left by prioritizing what needs to be done. Make a list of the most important things you have to do, and spend what time you have -- whether that is during the evenings or crammed into your child's nap hours -- working your way through the list. Sometimes you will find that you actually work faster when you have a limited amount of time, so you may accomplish more than you realize.
Ultimately, make sure you weigh the importance of work against the things that are encroaching into your work time. Our dog's illness is very important to me, for instance, and therefore her vet appointments can't be canceled, even if I have deadlines -- I just have to find other time in which to get the work done. Something less important, however, such as plans with a friend or a minor appointment, can always be rescheduled if your week starts getting too busy!