PLT OF AN EMS HELI FEELS HE DID NOT ENTER CLASS C AIRSPACE PRIOR TO MAKING CONTACT WITH ATC. HIS RPT IS 'JUST IN CASE.'

Narrative

I WAS RETURNING FROM A PATIENT XFER EMS FLT AT AN ARPT. THIS OCCURRED AT THE 10TH HR OF A 12 HR DUTY DAY THAT WAS FAIRLY BUSY. I HAD JUST TRANSITIONED THROUGH ZZZ CLASS D AIRSPACE AND WAS APPROX 7 MI N OF THAT AIRSPACE WHEN I NOTIFIED THE TWR CTLR THAT I WAS CLR TO THE N. HE TOLD ME THAT I WAS CLR OF HIS CLASS D AIRSPACE BUT WANTED ME TO STAY ON HIS FREQ FOR ONCOMING TFC NOTIFICATION. I WAS TOLD THAT THERE WAS AN ACFT AT MY 1 O'CLOCK POS CONVERGING AT APPROX MY ALT AND 2-3 MI AWAY. I DID ATTEMPT TO LOCATE THIS TFC FOR APPROX 2 MINS AND LEARNED FROM THE TWR CTLR THAT THE ACFT HAD PASSED AND WAS NO FACTOR. DURING THIS TIME I WAS SHOWING A GPS GND SPD OF APPROX 135 KTS AND MY POS NOW WAS 11 MI FROM XXX ARPT. I CHANGED FREQ AND CONTACTED THE APCH CTLR AT A POINT WHERE I BELIEVE I WAS OUTSIDE OF XXX CLASS C AIRSPACE. THE APCH CTLR ASSIGNED ME A XPONDER CODE AND APPROX 1 MIN AFTER I ENTERED THIS CODE; THE APCH CTLR AGAIN TOLD ME TO SQUAWK THE SAME CODE. I TOLD HIM I WAS INDICATING THE ASSIGNED CODE AND HE TOLD ME HE JUST PICKED UP MY POS AS BEING 8.2 MI FROM XXX ARPT. I WAS STILL INDICATING 3000 FT MSL IN ALT AND WAS WITHIN THE CLASS C AIRSPACE. I DON'T KNOW IF THIS WAS DETERMINED TO BE AN IMPROPER AIRSPACE ENTRY BY THE CTLR. I DON'T BELIEVE IT WAS; BUT I WISH TO RPT THE MATTER. I COMPLIED WITH ALL CTLR REQUESTS FROM THIS POINT ON AND HAD NO FURTHER PROBS. I BELIEVE THAT THE DISTR OF CLRING ONCOMING TFC BTWN ZZZ ARPT AND THE XXX CLASS C AIRSPACE WAS ENOUGH TO PUT MY RPTED POS CLOSER TO THE CLASS C AIRSPACE THAN I CARED FOR. HOWEVER; I FEEL I STILL MAY HAVE CONTACTED THE CTLR PRIOR TO ENTRY.