no, dr. bill; please note that wordwind's original post (two above mine) was so clever as to use each variation. My header was phrased to indicate that my spelling preference, as hers, is to have no period. and please, no "negative pregnant" jokes

Edit:
1) Btw, bartleby, http://www.bartleby.com/61/12/O0051200.html, indicates that the proper "spelling" is without periods. "WORD HISTORY: OK is a quintessentially American term that has spread from English to many other languages. ... Originally spelled with periods ..."
2) Of course I was teasing, dr. bill, but not unfairly: my post quoted accurately.