Just 1cc? Did you heat the oil before pinning? Aspiration? How quickly did the entire injection take? I've had to tell the wife numerous times to slow it down don't give 3cc's in there in 10secs - it Hurts! Did you train the injected muscle afterwards, or at least massage it?
It can hurt depending on placement... more nerves in some areas then others, and it's not exactly the same in both legs. Can also run into pain if you end up injecting between muscle heads, this is why I pin the side of my quads instead of the front side.