Over past 3 weeks I've put on half a stone, all my clothes are too tight and I can't wait to get into pyjamas/leggings at night to be comfy. Bra too tight as well. Went on mirena coil last 5 months ago - surely if it was down to that the weight would have piled on earlier than this? No change in diet - generally eat really healthily - odd biscuit at work at break, but no substantial change in diet. This morning, despite being knackered, got up and went for a run in desperation at size of stomach and waist - felt crap afterwards, fluey and achey! Have done a pregnancy test which was negative. Am peed off and perplexed as to why I've piled on half a stone of flab and don;t fit into my clothes. I was a healthy size 14, massive bazookas all my life, but have shot up to 10.5 stone and no sign of it shifting. Any thoughts?