Why am I malabosorbing like I am newly postop?

I am five years & six months postop RNY. I lost apx 140 pounds and kept it off. I am now nine months pregnant with twins. I've only gained 36 pounds. Recently, I have been again having "oil slicks" a lot of oily, orange gas when I have a bowel movement, but also when I pass gas. I remember that from my first year or surgery, but not much since then unless I eat something like crab with melted butter. I have not increased my fats. It seems like my body is back like it was right after surgery where I am malabsorbing a lot of fat. I even lost six pounds. It's embarrasing & I have not spoken to my OB about this. Anyone have any idea what is going on?

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