We did this... I had started a new job and we weren't going to TTC for 3-6 months so I could spend at least one year in the job. I hated it though and we ended up starting TTC right away instead.

After a few months I was so miserable and stressed at work and becoming obsessed with getting pregnant as my 'out'... and we were not getting pregnant. I ended up quitting and we got pregnant the month after I left, just before starting a new job! So I'd have to very much agree with what Hoobley said.