Is it possible to not experience implantation bleeding? Or does everybody experience it?

Somebody please help me!! ....I had my period June 21-27th and on July 2nd and by that point I was off my period for 5-6 days already I started bleeding bright red then pink brown and I told my sister and she said it could be implantation bleeding and ever sense then I been feeling cramps like mild cramps and throw upy and then on July 4th I started to bleed again bright red then pink brown then brown and by that point I was 7-8 days off my period still feel cramps from time to time and throw up...

i dont know if this implantation bleeding or starting of period help me

Did all of you mommies have implantation bleeding ?

Is small brown spotting considered to be implantation bleeding? And how soon after sex can implantation occur??