VFR general aviation aircraft with HPN ATC; described possible OXC Class D entry event; when RADAR service was terminated; instruction issued to change to N90 and significant turbulence was encountered.

Narrative

I was VFR to HPN; at 3000 FT; below a cloud base at about 3;500; receiving flight following from Bradley Approach. Just northeast of OXC; Bradley approach says 'radar services terminated; squawk VFR; contact NY Approach if you want advisories'. When they did this; I was within a mile of OXC's Class D airspace; whether in it or not; I couldn't tell for sure. I wasn't sure of my exact position; for two reasons: a) I'd been vectored around BDL traffic for a while; and b) the turbulence was so rough that maintaining heading and altitude was taking up most of my attention (aviate; navigate; communicate). It took a few minutes to raise NY Approach (they were busy); during this interval (after realizing I wouldn't immediately make contact with NY Approach); I did a 90 right turn to try to avoid or get out of the Delta Airspace. But I'm pretty sure I was inside the Delta at some point before I made contact with NY Approach. I was definitely in contact with Bradley Approach almost immediately prior to entering the Delta; and I think they would have advised me to contact the OXC tower if they hadn't coordinated my entry into the Class D with the tower. But I am concerned about the ambiguity; and the possibility that I may have inadvertently violated airspace.