Throughout my 1st pregnancy I didn't want anything but gas. When I went into labour I was nauseous and refused the gas so I had nothing. Mind you it wasn't a very painful labour or very long and I handled it fairly well

My 2nd labour I was a more open minded. I had a go at the gas but couldn't for the life of me time it with the contractions so it was pretty much useless, but it did take the edge of the pain.
I nearly opted for the pethidine and I would have but I had that gut feeling I was further along than what the midwife said.
Lucky I did refuse coz Jacob was born 1/2 hour later

For number 3 (when it happens) I am so much open minded. I will just take labour as it comes and I'm not worried about pain relief this time so I'll be going with the flow