odd spotting/period

I just had some odd spotting. I wasnt supposed to get my period until Tuesday next week but started spotting thursday last week. It started light pink, then brown, then orange/red, then back to light pink, but Saturday It was a dark red/brown mixed with lots egg white cm quite heavy and I had 2 quarter size clots but by night time it went away and now this morning my spotting is gone. I have no menstrual cramping but I have had pinching cramps, boobs are heavy and nips are sore, Im hungry but neauseas and more tired than normal. Im stumped. I took a pregnancy test but it was negative.