Bro I wouldn't worry about it to much yet. I've had shots that were sore for 1.5 weeks (mostly shoulders, biceps and calves). They would be warm/hot to the touch and red around the injection site. I would apply ice packs/heat to it everyday and everytime it would get better on its own. I've never needed to take an antibiotic for a bad inject however I do have a bottle in storage if the need ever arises.
It will hurt like a bitch for awhile but unless you truly think an abcess is forming there is no need for alarm. I tend to avoid the injection sites I listed above for these reasons alone. I hardly ever get sore from a shot anymore now. And I'm usually always injecting 3cc per site of pretty high dose formulas (500mg EQ, 600mg Test, Etc..)