Do you know the age/weight of your snake? If it's a hatchling, and is eating appropriate sized meals regularly, I'd think it would have already went through a shed, if not shed already. If it's older, it may be right on track, as I believe the shed cycles spread a little once the snake gets a little age on it. Younger snakes grow at a little faster rate so they shed a little more often... every 1-3 months, I've been told.
So, here are my questions...
1. How old is your snake?
2. How much does it weigh?
3. What and how often does it eat?
4. Husbandry - what are your cage temps/humidity?
These can all contribute to shedding.