Indeed. It was because I injected too fast. The pain is gone today but there is a 'lump' in the muscle... doctor seems confident it's just the oil.
On another note, is a thigh injection just as easy to do as a glute injection? It took me days to work up the courage to do my first glute inj. and I didn't even feel it! What about the thigh though, is the sweet spot just as easy to pick? (It's the distance from thumbtip to little finger-tip when the thumb is placed on your hipbone, right? I've read 2Thick's page, just wanna be sure!)