Period every two weeks after getting Mirena

Ca

So I got the mirena IUD in February and since then, the periods have been less and less in how much blood is released, but I bleed twice as often. One period is a regular thing, the other is practically just discharge, but blood. It sucks bc I totally wanted to go to the pool this summer 😣 is this the usual for anyone else just starting on Mirena? I feel like it's not worth seeing a doctor about 🤷