I accidently got some of my shot in the fat of my ass. Someone knocked on the door at my apartment and I looked up to make sure the dead bolt was locked. Simultanously still pushing the plunger. And when I looked down I realized I had only about 1/2 the needle in. I guess I pulled out a little in reaction to the knock. Anyways so my question is about how long will the swelling and pain in my ass last?