I'm getting cramps after wearing my waist trainer?

I wore it all day yesterday, on about 23 inches. (My waist is 25 inches so that's pretty tight. And today I got bearable pains in my abdomen, making me feel a bit sick. However, my periods going to start in two days, so I'm wondering if that's the problem. Has anyone wore a wait trainer before and experienced similar problems?
I'm getting cramps after wearing my waist trainer?
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