For FHIR Observations, the clinically relevant time is the time the assessment was made. Observation.effective [x] is defined as  The time or time-period the observed value is asserted as being true. For biological subjects - e.g. human patients - this is usually called the "physiologically relevant time". This is usually either the time of the procedure or of specimen collection, but very often the source of the date/time is not known, only the date/time itself. 10.1.5.7 Physiologically Relevant Time of the Observation  The effectiveDateTime or effectivePeriod is the time that the observation is most relevant as an observation of the subjec t. For a biological subject (e.g. a human patient), this is the physiologically relevant time of the observation. In the case of an observation using a specimen, this represents the start and end of the specimen collection (e.g. 24-hour Urine Sodium), but if the collection time is sufficiently short, this is reported as a point in time value (e.g. normal venipuncture). In the case of an observation obtained directly from a subject (e.g. BP, Chest X-ray), this is the start and end time of the observation process, which again, is often reported as a single point in time. To wit SDC documents the mapping between Observation.effectiveDateTime to QuestionnaireResponse.authored. The “state or condition of being pregnant” is represented by the LOINC 82810-3 Description: This term should be used to indicate that the patient is currently pregnant, not pregnant, or that the pregnancy status is unknown at this time. The “intent to become pregnant” is represented by the LOINC 86645-9 Description: A patient's intention or desire in the next year to either become pregnant or prevent a future pregnancy The duration of intent or status is a separate question not represented by these profiles.