Methods of monitoring for influx (kick) and/or loss events in a wellbore are disclosed. A method includes receiving at least three measurements relating to fluid entering or leaving the wellbore 120; comparing at least two of these measurements with an expected value for the measurement to provide at least two respective deviated measurement values; establishing whether an influx event and/or establishing whether a loss event may have occurred 160 based on these at least two deviated measurement values. The measurements may include pump pressure. Systems configured to monitor influx and/or loss are also disclosed, utilising sensors 115 and processor 116. An auditory or visual alarm may be raised when an influx or loss event is detected.
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