Yep I was told I could have it any time from 38 weeks, and if the baby wasnt ready it wouldnt work. So thats when I was planning to start.
I didnt know I might have trouble finding a practitioner to do it that early..

Are you already seeing someone? I think that is why mine was ok with it - I had been seeing him since 18 wks (not 20) - I remember that now cos I was still having m/s and he helped with that, and we didn't know the sex at that time .... he knew me and my preg history.