My cycle is 3 weeks away i took plan b ,im having weird grumbles in my stomach 6 days later, also bleeding .im having some pregnancy symptoms,spotting,tiredness,and body being sore.ive taken a pregnancy test yesterday it showed negative,more info?

The timing you describe does not suggest a high risk of pregnancy and the spotting is likely an effect from the Plan B. Spotting and body aches (and weird grumbles) are not considered symptoms indicating pregnancy and fatigue is nonspecific. A pregnancy test would not turn positive for another couple of weeks (about the time you expect your period).