Sometimes weird things happen with charting... My temperatures tend to stay up until well after AF has arrived. The chart where I was pregnant had a really impressive temperature crash right when AF was due. You'd honestly think I'd labelled the charts incorrectly. I've had one other cycle with a very early miscarriage, implantation happened, but AF arrived on time. That chart sits in between the other two.
Are you on any medication that is different to normal? Had you consumed any alcohol the night before? Both of those things can effect temperatures. It's also rare, but possible, for women to have AF as normal while still pregnant.
BW


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