I saw that on a two weeks revealed magazine cover. I reckon the most likely candidate is Max. It wouldn't be Bradley urely because she was pregnant with bradley's baby before and had an abortion so it would just be a repeat. She only had a one night stand with Deano or will have next wek and it doesn't open up many stoylines so it's got to be Max's if Stacey really is pregnant.
Wonder if this is how Bradley finds out about the Stacey/Max affair if he does.