38 wks pregnant, and needing advice?

i am 38 weeks pregnant, im needing advice , my previous partner, the father of my 6 yr old has just phoned out of the blue wanting access to see her, however im afraid of him and the confusion he will cause to her since he walked out on us when she was 6 months old because i could not bare him hitting me anymore ,a week later following a accusing letter that he did not think he was the father of Angel < the daughter in Question>.... i got in touch with C.S.A of which he phones me up and says that he tore the form up. however about a year later they < his parents> phone i agreed to give his Parents access to see my daughter , the day they arrive they bring down Angels father and try to hook me back up with him ......that was thier last visit i had not stopped them but only now after years of no contact they want access to her she is now six, im worried that this will confuse her as she is used to knowing my husband her step dad as being her father is there any way i can