Agreed, I came to post a similar post. The number on the scales is a wholly unhelpful thing and serves to distract us from our amazing progress. How our clothes fit, our measurements and how we feel are much better indicators.
I would add to focus on increasing your fitness/running times etc Claudia instead of thinking about your weight.
Our weight can naturally fluctuate daily depending on many factors, the ones often overlooked are whats in our colons, glycogen stores and fluid retention due to a b12 deficiency/hormonal factors, and salt consumption.
Yes, I don't own a pair of scales, so I was shocked when I got on a friend's scales and and it said 66 kilos when my normal weight was 60 kilos. Even though I'd started fitting into clothes I couldn't fit into for years and my indicator pants (pants I use to indicate where I am in regards to my body shape) were loose!
I thought at first that there was some mistake, the scales were off or something, but she is a personal trainer and keeps close tabs on here weight and said the scales were right on track.
Now for me, I'd always known that muscle weighed more than fat, but this much? But clothes don't lie, if you look slimmer and you fit into clothes that were previously tight or you weren't able to fit into, thats the proof of the pudding.
For me it really brought home why I feel scales are silly! :) Don't worry about it!
Happy to weigh more than I used to!