Period changing milk?

Julie • #3 birth baby due 12/8/21. Biological children are 11 and 4. Step-children are 12 and 8. All boys!!
My period came back today, and my LO is 10 weeks and EBF. I hoped it would stay away longer but no luck.   Today his stomach has been weird. He's been spitting up way more than usual and it's not just milk it's like stinky spit up if that makes sense. I'm wondering if my period could be affecting my milk. Anyone experience this? 

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