I'd agree with Dogmama when she says that body fat is probably a better indicator rather than overall weight.

Over the last few months I've been doing plenty of cycling as well as spinning and other gymn stuff, and from just going by the fit of my clothes and which bits I can or can't grab on my bod, I would say I must have lost weight. But when I weigh myself on the scales my actual weight hasn't really changed greatly.

I think there's been some muscle gain in my legs but apart from that I think it's just the wobbly stuff has tightened up!