Girls I have a question I have a 7 month baby girl and I have not gotten a period ever since and a few days ago felt…

Girls I have a question I have a 7 month baby girl and I have not gotten a period ever since and a few days ago felt something move inside my stomach and my milk supply is really low like I get full but when I pump I barley get an 1 ounce before I would pump 5 ounces and took 2 pregnacy test and negative can any one help with there advice