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Billings Ovulation Method ©
red green yellow white green yellow  
I
bleed spotting dry infertile dry - wait and see rule discharge
infertile*		 unchanging discharge- wait and see rule   # Peak 1 2 3 days after Peak; possibly fertile; dry or mucus which is not wet or slippery  
possibly fertile
I

* (i) BIP of unchanging discharge before peak (ii) from the 4th day past the Peak
# breakthrough bleed		 I intercourse