(Closed) Does a drop in BBT predict the arrival of AF?

posted 5 years ago in TTC
Post # 3
881 posts
Busy bee
  • Wedding: September 2012

@mysterybee123:  Here is what FF says: If you see a low temperature around the time you would expect your period, your period is usually on the way. In most cases, you will see your period sometime that same day or the following day.

However, I have seen some charts where women’s temps don’t drop until AF has already arrived.  In my case so far, my temps always drop off the day or day before AF comes.  But it is possible to have AF come even if your temps don’t drop although I don’t think that is as common.

Post # 4
4574 posts
Honey bee
  • Wedding: April 2012

I agree with PP.  I have seen the same on some other charts, but for me, it actually dropped yesterday and AF got here yesterday.

Post # 5
1081 posts
Bumble bee
  • Wedding: June 2012

I always found the suckiest thing about temping is there’s no way to really know what one temp means until you take the next one the next day.  On the 2 cycles I charted and got AF, when my temp went down I usualy started spotting, but didn’t get full-blown AF for a day or two (or three) later.  Everyone is different and the only way to get good at interpreting your own chart and temps is to get a few similar cycles under your belt.  That said, however, it is not uncommon to have variations in each cycle either.  I think the uterus is a pretty bipolar organ…lol.  

Post # 6
3697 posts
Sugar bee

It probably means that it’s on its way, but it doesn’t necessarily mean that it’s imminent. My latest cycle, my temp dropped for a couple of days before AF actually arrived.

Are you really looking at just a 12- or 14-day cycle, though? That seems *really* short. Or is it because you’ve just started charting and you started mid-cycle? As a PP noted, after you’ve built up a couple of cycles’ worth of data, it will be easier to spot your own patterns and know how soon your period is likely to arrive based on your temperature shifts.

Post # 7
441 posts
Helper bee

My temp usually drops quite a bit a few days before my period starts, and it continues to go down a little more during my period. It’s my biggest sign that my period is going to start soon, other than my lovely three to four days of spotting!

However, it also seems to be pretty common that some women’s BBT remain elevated throughout their period and then drop off later. If my BBT stayed above the coverline through my period, I’d take a test though just to be sure.

So, a drop in temps could mean your period will start ASAP, or it could start in a day or two, or it could just be faking you out. You won’t really know until you temp a few more days and/or you start to see a pattern developing in your cycles.

Post # 10
4583 posts
Honey bee
  • Wedding: October 2011

When I was charting, my temp always, always dropped the day AF arrived. That was how I knew to POAS, when AF was a day late and my temps were still elevated the next morning. 

Post # 11
1406 posts
Bumble bee
  • Wedding: November 2011

When I was charting, my temp always dropped the day I started.  It sucked but at least I knew to throw some tampons in my purse and go to the bathroom more that day.  

The topic ‘Does a drop in BBT predict the arrival of AF?’ is closed to new replies.

Find Amazing Vendors