It was just a weekend setback. Pretty small in the grand scheme of things.
I remember someone posting that they had a couple of these while NDing, and they just added the number on days onto the end of their 8 weeks, to ensure that they got the full 8 weeks.
IMHO you should be congratulated for staying on the low carb bus, and not derailing into chocolate and sweetness. Well done, and hope today goes well. You will find it much easier to get back to ND without carb cravings mucking things up.