According to the spoilers Bradley goes away for a few days on his course, as soon as Stacey arrives back. He probably puts the phone call thing to one side at that point. But then she runs off when he suggests they have a quickie before he leaves. He tries to get in touch with her while he's away, and she keeps ignoring his texts. So I can see how he'd get suspicious at that point.
But I think the thing it said on the magazine 'dumped?' was referring to Stacey thinking he'd dump her if she wanted to keep the baby. Lacey goes on about Stacey being scared of telling him. But she also says she doesn't know why she is because she's sure he'll be supportive.
Anyway I think Bradley is going to come back with a bee in his bonnet about Stacey ignoring the texts, he accuses her of some stuff, maybe in front of Sean, which will not go down well. And then Stacey tells him she's pregnant. I'm sure it'll sort itself out.