Rachel my doc made me take it 5-9 the first mth I tried it..but tht routine didn't work and I didn't really o in Gud time as in I od late..then he got me to try cd3-7 n tht worked well and I've always been on Tht routine..however bcos this mth dates r screwed up bcos of spotting I either started on cd2-6 or I took it cd5-9 ...aahh well we'll c...my doc never really told me the logic of the dates just tried the 2 routes and continued with wat worked for me..I guess thts wat ur dr is doin