Hi you start with CD1 on the day your period starts and each day add another day my period started on Sunday so I am CD4 today. have you any idea when you ovulated as your period is usually 14 days after that if unsuccessful you may have oved late thus a Neg good luck x
Cycle Day 1 (CD1) is the date you first start your period so you count each day from that until your period next turns up, so if it turns up CD29 that in effect becomes CD1 of your next cycle and your cycle is 28 days long. You are at your most fertile around 14 days before your next period. Hope that makes sense there are others on here much more knowledgeable than me!
I don't know, my period was late by a week once (unheard of) and I got BFNs. Turned up a week later heavier than usual, nurse said it was probably a very early miscarriage don't know if this was true but don't want to scare you either.
I may go get a first response and then take it on Friday morning if no sign of AF, for then that will be CD 38 - ARGH!!! Thanks for the support, really am new to this TTC larky, my DD was a complete surprise (poor DP!!!)