It would be interesting to know the thinking behind the decision to return her to the UK.
Falklands is classed as operational - pregnant is not compatible with ops and the default answer is to be sent home - the default answer since I can remember.
From another angle - how could the MoD possibly ensure the proper antenatal care for the individual when deployed? It is a part of life when non-military medical care takes the lead and therefore outside the normal deployed med centre.