I have been in that situation with Cleveland approach before, and all I can say is:
If you're operating under VFR and you dont hear that magic phrase "Cleared into the class bravo airspace", you absolutely need to get clarification.
I asked the cleveland controller if I was cleared though, he replied that he had forgot about me, and promptly gave me my clearance though the Bravo. Never take anything for granted when operating VFR.