After brushing teeth,is this like throwing up?

After brushing teeth,is this like throwing up?
after i brush my teeth,ill gargle with water,but sometimes i have a really bad gag reflex and i like gag and brown like mucus comes out,not all the time but sometimes,is that the same as throwing up,like is that what it seems like to my body,because i do this quite often,i dont make myself do it it just happens,and i dont want it to hurt my body,and what could be coming out,like i said its like a brown mucus comeing from my throat,is it just from overnight do you think?

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