Rhumba - is your Caullophylum drops or pills?
If you start with mild contractions you can take one dose (for drops that equals 4 drops, not sure how many pills) every 15 minutes for 6 doses (that is every 15 minutes for one and a half hours). After that you can take a dose every 6 hours (and repeat the "every 15 minute" dosage, if things start up again). Take your first dose as soon as you start even the mildest contraction.
When I took mine, I didn't feel any differnce in that first hour and a half, but then I went to sleep and after that I woke up in full-on labour.
If you do not have contractions yet, then you can still take a dose every 6 hours. However, I have heard that it only works once you actually start with contractions. Others say it does work before contractions start, but is MOST EFFECTIVE after contractions start.
Hope this helps.
Good luck. I am sure that this stuff really got me going (after a week and a half of stop-start-stop-start contractions I went into labour after taking my first 6 doses 15minutes apart).
BTW the dosages above were not what was on my bottle - but what was recommended by a very experienced mw, and also research on the internet