Spotting and No period

Rogue
So I was supposed to start like a week or so ago.... But all I've done was have one spot and that was it for two days and then one spot again and that was it.... I had bad cramping for one day.... And no my boobs feel heavy and sore.... I did test and it said negative? Maybe I tested too early? Idk. This has never happened to me before.... What's going on?