Hi Kell.

When I was on Chlomid I found the same thing. Some months I was sure i was pg as AF was late and I was feeling tender. If your charting I'd say go by what it says as your due date because charts usually work on averages. So it would take the average length of your previous months and calculate when AF is due. It can be confusing and frustrating but I think it would be better to wait the extra 3 days and know that your not testing too early.

How long have you been on Chlomid? Is your doc still testing you at cd21 to monitor whether you are ovulating. If not get yourself an OPK so that you have some idea of when you are ovulating.

Wishing the best for this cycle. Hope you get your BFP.

Tina