Weekly weigh in

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I weigh weekly now (I was doing it bi-weekly but my weight fluctuates so much that it didnt help me to keep an eye on the overall loss). Anyway, I was wandering if anyone elses body is like mine: I normally weigh on a Thursday / Friday - straight out of bed after going to the toilet (this is actually what I do every day, but only offically record weekly). Saturday through to Wednesday I am majorly down in the dumps cos it looks like my weight is either staying the same or gaining - but then BAM on Thursday I lose like 1-2 lbs weekly (with occasional blips up, but generally down) - this is great, I love it, but its an emotional rollercoaster expecting a gain and then being majorly over excited about a loss! Does anyone elses body do this over the week - seriously there is no change for 5 days (in fact I normally gain over them 5 days - hence no morre bi-weekly weighing) then all of a sudden I will drop weight - I would have expected more steady loss over a week, or am I wrong and this is how it is for everyone? Thansk in advance

Sarah