First, your field code should be reduced to:
{if{page}< {numpages} "Continued..." "<table is here>"}
As for the last paragraph, ensure
nothing (including an empty paragraph) follows it. Then make sure your last paragraph is formatted with the 'keep together' and 'keep with next' attributes.
Even with those measures, though, you will sometimes find Word getting confused as to what to do. In such cases it's probably best to insert a manual page break before the final paragraph.