I have a 31 day cycle and suggest starting cd12. This gives you a few definitely negative days to see what the sticks look like! I don't always get the second line darker than the control but by seeing the pattern and charting other signs I can usually spot the peak ovulation stick now.
Thanks v much Happy, yes they're the little strip cheapy ones..... Couldn't justify the digi ones so far and I have a bad poas habbit!!! Or at least did when we were trying for DS so these cheapy ones are fine if I get carries away andstartpoasafewtinmesaday .... cycle is usually 30/31 days ish.... So shall start testing day 13/14 ish I guess just in case I ov early???
Are they the little strip variety? How long is your cycle? Most people ovulate 14 days before AF is due so I would start using them about 17-18 days before AF is due. It's positive if the test line is the same colour or darker than the control line and usually means that you are due to ovulate in the next 24-48 hours but it's not an exact science. I find the digital ones far easier to work with. Hope this helps!