I don't recall, but it I think I should have definitely done as married and put the date of future, the day we got married. It was a single application.
I just checked my DS160 confirmation, it doesn't say married or single.
But Even putting a single should have no impact on your application. You can always explain the situation if they had some questions.
But if you are so much in doubt just do after marriage and email them to get earlier dates.
They had helped me twice moving my dates earlier.