Should I wash my hair tonight or tomorrow evening?

This is probably the silliest question but I don’t know what to do. If i wash it too soon it’ll throw everything off. I usually wash my hair once a week and my husband is coming into town this weekend and I can’t decide if I want to wash my hair tonight or tomorrow evening after I get my nails done. The last time I washed my hair was last Wednesday.
Should I wash my hair tonight or tomorrow evening?
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