Kerry Katona is considering having a sixth child after doctors told her she is still able to conceive. The former Atomic Kitten star, 43, has five children from previous relationships and she’s confessed she’s open to having another baby if her fiance Ryan Mahoney decides he wants to be a dad but she has decided she would use a surrogate after the “trauma” of her last birth. In her column for OK! magazine, she wrote: “I was told [by doctors] that I’ve still got follicles – meaning I could have another baby. I don’t think I would have another one, but Ryan keeps changing his mind! If he wants a…