Gut infection with bacteria called salmonella and campylobacter may be associated with an increased risk of pregnancy complications.

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

It is possible that other food poisoning bacteria may also cause complications during pregnancy. For example, gut infection with bacteria called salmonella and campylobacter may be associated with an increased risk of pregnancy complications. So, it is wise to be extra vigilant about avoiding food poisoning.