Is It Safe To Consume Unpasteurised Fermented Vegetables During Pregnancy?

Hi, Is it safe to consume unpasteurised fermented vegetable foods (other than milk) such as cucumber, gherkins, olives, cabbage from 12 weeks of pregnancy? Also, on a separate note can someone with last stage renal failure drink milk kefir or eat fermented vegetables or take probiotic supplements? Please let me know.