I had a great home birth not long ago and from my experience any period pains or cramps mean labour has started.
my baby took 4 days to come, I coped by sleeping in the birth pool and listening to relaxation music.
I didn't need drugs, because the more I relaxed the less it hurt. It really pays to be relaxed, patient and positive during labour - because as soon as you start doubting yourself, you'll stress, panic and the pain will increase.
My baby's head wasn't engaged until well into my labour, this is quite normal.
Also the a week before I was due my baby was still breach and in a posteria position.
She turned as labour started.
Also I was eating through my labour, which kept my energy levels up, but I started vomiting before I had to push the baby out.
before the baby came the pain changed from a period pain to cramps (like a leg cramp) in my lower stomach, then I made sure I was fully dialated and started pushing.
As soon as I could push, all pain went away, and it felt just like doing a poo. I did have a back pain that I just had to try and ignore - but the pools hot water helped and getting my hips jiggled by my husband.
The only problems I had was being constapaited when I was in Labour, I got confused as to wheather it was the baby comming or my just wanting to go to the toilet.
So I had a lot of trouble, but I managed to go to the toilet between contractions.
I think next time I will eat a whole lot of prunes. Also I drank up and go and ate punkin soup - which were both easy to stomach when I was labour.
Through out my pregancy I had the most terrible moring sickness and all I could eat was mainly raw food - www.hacres.com
this book helped me eat well, while I was pregnant.
Another great book is: Ina May Gaskins Guide to Child Birth - It answer all the question about labour and pregnacy and its read advice from mothers, its not another one of those medical books. It has lot of different encourging birth stories in it, it really boost the confidence.