Help Period

Stephanie

I don’t know whats wrong with my period i got a regular period 5-7 days i got off it for a week then it came back and it hasn’t gone away i have had it for almost 20days now but this one is light no clots i took a pregnancy test and it came out negative I’ve been having cramps as well as my appetite has decrease and i get nauseas and i get tired more often. Any ideas of what it could be??