If it’s Dexcom, see if they’ll let you wear it till the sensor dies. I keep mine in for at least 14 days most of the time. Because all you have is a short time, eat what you regularly do and keep careful logs of what and when you eat so you can see what your BGs do in realtime. I was very surprised how some regular meals affected me. I also found that with bolus insulin, timing is everything. Good luck.
