David Gallacher, 37, of no fixed address, attacked Samsam Haji-Ali, 34, and her husband outside a Co-op in Bletchley, Buckinghamshire, in August.
He admitted actual bodily harm, assault by beating and two counts of racially or religiously aggravated assault.
The judge called him a “thug and a racist to boot.”
Aylesbury Crown Court heard Somali Ms Haji-Ali was racially abused by Gallacher in the Water Eaton Road shop on 4 August.
He swore at her and said: “You come here with your clown outfit on…”
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As her husband Abdullah Sulamain, 40, attempted to calm him down in the car park outside, Gallacher hit him on the head with a bottle of wine and a bag of ice.
He then kicked Ms Haji-Ali in the stomach.
Judge Francis Sheridan said: “She told him she was pregnant and he continued to kick her again, after he was told she was pregnant.
“She is left rolling around on the ground in agony and later found there is bleeding, before she lost the baby.”
