The effectiveness of Tri-Sprintec is reduced (only very fractionally) if the pills are not taken at around the same time each day. You probably have a lee way of a couple of hours either side of your regular time - where it makes no difference.
Usually if you take it in the same day it isn't much of a problem. I have accidentally forgotten them till morning a few times, and was fine - but I don't remember having unprotected sex either. As a general rule in the same day is fine... Missing a day can cause problems.
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