Salt water flush for constipation?

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I used to do salt water flushes before I was pregnant when I was constipated. It's about 1 to 2 tablespoons of salt mixed with a quart of water. You pretty much chug it and it cleans you out almost instantly. Has anyone tried this while pregnant? Or asked a doctor about it? I've been backed up for days and it's really uncomfortable. But of course I'm not gonna do anything that negatively impacts baby.