So im back, for those who havent read any of my questions : I had unprotected on the 13th, my period isnt?

really due until thurs or friday, i have been spotting and cramping since Sat, tonight i felt like i needed to use the bathrm and throw up so i did... and i threw up a couple times, the cramping is still there but the thing that worries me is that instead of just a spot of blood, there was a good amt, as if it were my actual period, but now still the same night, its back to a brownish pink spotting... i am so confused and at first i thought i was experiencing implantation bleeding, and the cramps hurt but they are very dull, not as strong at menstrual. Im sorry if i confused some of you i just need some sort of advice..PLEASE HELP! thanks all