Yeah, this. Just book the first day of your sequence in advance and proffer for a trip. That way, your bases are covered. After you get off probation, you can get more creative. If you fly earlier in the month, your credit will build and you will be less likely to be used, and you can sit at home and not worry about it later in the month. The APA app is pretty good about telling you where you are in the assignment queue and you can view the open time and assess your likelihood of being used.