Is it possible to gain 6-7 lbs in a weekend!?

I have asked this before of people, listened to their replies, but I think I have to hear it over and over for it to sink in. I am fighting weight and gaining muscle at the same time. I am doing this on my own. Meaning I have no real support and no real "cohort in crime" so to speak. This weekend has been extremely lazy, shopping, church, eating and regular housekeeping because it has been dreadful outside. I couldn't go to the gym all weekend, and my scales were at 139 Friday and early Saturday morning. This afternoon- Sunday, they said 145. Is it really possible that it is fat weight or could it be muscle in relaxation mode building. I have eaten nothing out of the ordinary and have actually lessened my sugar because this weekend was so boring. I don't feel bloated or swollen, but I feel so lazy and worthless because normally I am an extremely active individual. Is it just mind of matter, and the scales will be right tomorrow or even a pound heavier or am I really that fat again? Please don't be rude in replying. If you cant say anything worthwhile, then don't reply at all please. Thank you so much in advance!!!