Thanks for your replies!
I tried to work this out when TTCing with DD, however, that was a while ago now! My cycles ran 29, 29 ,29 then everynow and again, 25, to bring it back into sync with the moon. When I look back over my journal now I realise I conceived DD in a 25 day cycle, but I haven't been able to work out what phase the moon was in at the time (not very clever with astrology things, I'm afraid).

I'll be keen to hear if anyone gets any results from this!
:-)