did a quad injection on thursday night and once the needle was fully penetrated for some reason my quad contracted involuntary. Began to inject and everything continued as per normal. However when withdrawing the needle there was more blood then normal. I put pressure on this and the bleeding stopped. Now 3 days later my quad is in agony. I cant even walk cos it hurts so much when the muscle contracts. I went to the doctor and he said that it could be a possible infection and prescribed anti-biotics and pain killers. My question is could this be a possible infection and should i take anti-biotics? Will the anti-biotics have any negative effect on my cycle or my gains? Do you think i hit a nerve or something? Thanks.