I think holidays are such a good idea - so many people have suceeded whilst on hol as you relax - but it should hopefully last a few days when you're back too!!
We tried to chill at first and were quite good at relaxing, I started to panic at about six months, so started using OPKs because i was convinced I might not be ovulating - they have actually made me relax more as now I know when I ovulate so I know when to concentrate out efforts

and also I know my LP is around 18 days so I know when to expect AF. I used to get so stressed/ excited when I thought it was late and I was probably just ovulating a different time! But some people find them a bit of a stress!.
I'm keeping everything crossed for you - but don't worry and try to enjoy it. I was so stressed at three months as I was convinced something was wrong with me as I hadn't fallen straight away!! Isn't if funny when you spend years and years trying not to get pg and then when you want to... I don't know how these unplanned pregnancies happen - I think all teenagers must be at it constantly whilst not using any protection!!
Rach x