Experience of IF with Mirena?

I've had the Mirena IUD for 8 years (not the same device - one for 5 years and current one for 3 years!), and generally my periods are very light/intermittent if at all. However, when I fast for more than 16ish hours, I start seeing blood basically right away, and continue bleeding/spotting for a few days. It's not generally accompanied by other period things (cramps, headaches, tiredness) - it's just like hitting the 16-hour mark opens a mini floodgate in my body. Does anyone else have this experience?

Answer

Weird! I basically never get my period on the Mirena- suuuper light spotting maybe every few months, if anything at all. I’ve never had this experience, but I have had some subtle cramps on longer fasts (24+) that I’ve wondered about. Not sure if it’s related or if I’m just more aware of what’s happening in my stomach/uterus region when I’m fasting.

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I’ve had the Mirena since before dabbling with keto (not currently following) and later IF and shorter term fasts. IF doesn’t seem to do anything noticeable, but I’ve noticed that fasts longer than a two days seem to guarantee a decent chance of spotting… which tends to undo the work as I justify binge-y cravings after ending the fast as “that time”. Ah well!