Not sure whats going on

Georgina • Im 27yrs old and have 1 child love him so much❤❤
My breast been feeling tingly and milky im not sure why... lately i been sleeping in alot i havent had my period for 4.5 months now i took 2 test last week and they both came out negative and i do have cramps but not sure whats going on ??? Has this happened to you???