You may not wish to discuss with your employer your intention to become pregnant, but have a health and safety concern at work.

http://www.patient.co.uk/health/planning-to-become-pregnant

You may not wish to discuss with your employer your intention to become pregnant, but have a health and safety concern at work. One option then is to contact the HSE for advice on their Infoline - Tel: 0845 345 0055.