You could of hit a nerve on the way in, or you injected too fast bro. 2.5ml injected in a quad isn't alot at all. Keep taking the Ibuprofen, it should help with the swelling and possible pain. Don't elevate your leg, keep yourself moving, your body needs to get use to it
Also when you stuck the pin in, was there any muscle twitching going on? If there was, you most probably did hit a nerve
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Deadlift : 600lbs X8
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