If you are only going for a short period of time, it makes sense to try to stick to your usual time if it is not too inconvenient. If your trip will last longer than a couple of days, or if your usual time will come out at a very inconvenient hour, you can gradually transition to a more convenient time. Take your pill an hour or two earlier (or later) each day until you reach a time that suits you, and the reverse on your return.
Please note that it is still possible to experience some spotting, even with a gradual transition. You should review the
laws of staining to try to prevent any staining you may experience from rendering you
niddah.
Please feel free to get back to us with any further questions.
B'Hatzlacha!