Well, yes and no, depends on the engine the docx was created. The pages are actually renderized on the engine you are running your docx file, what I mean with that: for example, the pages can be different if you open a docx file on google docs or office package. But there is a way to get the possible pages that were created. You must search for something like this in your xml file:

if 'lastRenderedPageBreak' in element._element.xml or ('w:br' in element._element.xml and 'type="page"' in element._element.xml)

this is a page break, than you must keep track of your pages for this to work.