Kerry Katona is pregnant with her fourth child - but there are fears for the unborn baby's health.The British reality TV star, 27, last week (21Sep07) visited specialists at a private hospital in Chelmsford, south-east England, where doctors confirmed she was six weeks pregnant.But the medics also warned Katona and husband Mark Croft that there are major "complications" with the pregnancy.A source tells British newspaper The Sun, "She's had problems with her other pregnancies - and this time she has been losing a lot of blood."The doctors weren't sure exactly what the problem was at first, but now they know and it's not looking good at all."Katona and Croft are already parents to Heidi, seven months, and the former pop star has two daughters - six-year-old Molly and four-year-old Lilly-Sue - with ex-husband Brian McFadden.

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