That is correct, thus far, there are no punctuation marks.
Punctuation[edit]
Women's script has only one known character for punctuation. It is a single vertical line with two small, horizontal lines at the top and bottom. It is written at the beginning of a sentence and it defines the maximum character height. Questions are marked by adding “ha” at the end of the last word in the sentence. There is also a question mark present in Navani's sketch in Oathbringer on page 447, but judging by the handwriting this was added later by Nazh and is not part of the women's script. There is also a diacritic mark denoting if a letter in an otherwise symmetrical word is pronounced “h,” but it is currently unknown what this looks like,[4] only that it is present both above and below the letter. It is unknown what other punctuation exists, if any, as no other examples have been observed.
https://coppermind.net/wiki/Women's_script