Need help

Asuncion

Hello ladies I have a question. Iv have been cramping on and off lately I don't know why . I had gotten my period twice this month and they both didn't last long . I took a pregnancy test a week after my 2nd period and it came back negative. Today I took a pregnancy test and it also came back negative. I'm starting to worry about my health . Has this ever happen to anyone ? Is it normal?