I don't think travelling, yoga or going upstairs prevents your chances of getting pregnant. I travelled during my 2ww when I got my bfp and it did not seem to affect anything. You should avoid strenuous activity but in general ttc should not affect your life.
The egg after release travels to your fallopian tube and hangs around for 12-24 hours to be fertilized. So, I want to say that it takes 24 houors for the egg to release and fertilize. Note that egg does not live beyond 24 hours unlike sperm that can hang around for days.