This is the ValueSet that contains all the codes in Pregnancy Status Determination Method (http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.11.20.9.80) and Pregnancy Status Determination Method (http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.11.20.9.80). E.g. what you have to deal with if you get resources containing codes in either of them