They day I first discovered a bruise was tough.
I'd felt like I was going really well and then after feeling uncomfortable at work all day I got changed and noticed I bruise on my stomach. It wasn't too bad but until that time I was feeling really cocky about the process - 'side effects - pffft I won't have any side effects'.
I think it was good thing though. It bought me back to reality a bit. Really just one bruise or even some crappy side effects were worth the end goal and I knew that I could get through it.