Does it matter time of day AF shows?

iVillage Member
Registered: 02-17-2002
Does it matter time of day AF shows?
Wed, 10-29-2008 - 5:40pm
I've seen mixed replies in different places. I think there's consensus that CD1 is the first day of full, red flow. But what if that full flow doesn't hit until evening? Does that still count as CD1 or do you count the next day, which would be the first FULL day as CD1? On other sites I've seen some people say if it's after 5 or 6 pm, count the next day, others say if it's after noon, count the next day and some say if it hits anytime before midnight count it that day. This time I spotted on 10/20 and then spotted most of the day 10/21 but then got the heavy flow around 7 pm that night. So do I could 10/21 as day 1, making my last cycle 28 days or do I count 10/22 as day 1, making the last cycle 29 days?
iVillage Member
Registered: 08-23-2005
Wed, 10-29-2008 - 7:59pm
You know, I don't think it really matters as long as whatever rule you use you apply consistently to all your charts so that you get a stable chart month in/month out.


Avatar for cl_susanmercy
iVillage Member
Registered: 03-19-2003
Thu, 10-30-2008 - 12:51pm
Ah, that can be a conundrum!
iVillage Member
Registered: 07-28-2005
Thu, 10-30-2008 - 9:44pm
I'm with Sue on this one. I usually used midnight as the cutoff, just to have keep it all straight. However, if AF arrived in full force at 10 or 11 at night, I would likely mark it as the following day.
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