hannah campbell , 30 , had miracle baby after shrapnel damaged her womb .
but since birth she has battled with a mystery illness - nearly dying twice .
as she tried to recover her relationship with long-term partner broke down .
anthony mcmorrow , 32 , agreed new baby lexi-river will be their priority .
she will have tests next month to explore what is causing rare condition .
miss campbell 's pregnancy appears in my extraordinary pregnancy , starting on monday on tlc .