Hey guys, I just started at this 3 days ago and I've been hitting it pretty hard every day. (Until tonight, every muscle in my body hurts!!) For the last 3 months or so, I've weighed 150 lbs on the dot. I weighed myself this morning and I weigh 155 lbs now. I'm taking creatine and whey protein. My question: why have I suddenly gained 5 lbs? I know damn well I haven't gained any muscle in 3 days lol. Does the sudden exercise cause the muscles to retain water maybe? I'm not worried about gaining the weight or anything like that as I'm trying to bulk up, I'm just more curious as to why this happens as I like to learn as I go with new things. Any help appreciated.