I have ordered the clearblue fertility monitor on day 1 of cycle but it is taking ages to come and by the time it gets here will probably be day 7 or 8. I have read the latest you can start is day 5...question is would you just start using it when it arrives or leave it this month?? My cycles are all over the place so need its help - I conceived first month off pill but unfortunately had a miscarriage and it has take me 10 weeks to have a period!!!!