First of all, congrats. You're off to a great start, and out of the gate faster than 95% of new writers. And you're obviously doing something right or people wouldn't be pre-ordering book #2.
Having said that, learning to write on a deadline is a new and difficult skill. Until you can be confident that you can put your butt in the chair and have eighty or a hundred thousand polished words in three months, it's going to be pretty scary to get your book up for pre-order. The best thing you can do is sit down and work like hell to make sure it happens. If you struggle this time, don't put another book up for pre-order until you're more confident in your ability to hit short-term deadlines.
Good luck!
Having said that, learning to write on a deadline is a new and difficult skill. Until you can be confident that you can put your butt in the chair and have eighty or a hundred thousand polished words in three months, it's going to be pretty scary to get your book up for pre-order. The best thing you can do is sit down and work like hell to make sure it happens. If you struggle this time, don't put another book up for pre-order until you're more confident in your ability to hit short-term deadlines.
Good luck!