early pregnancy symptoms, i hope

i had a lost tampon, & when i realized it had been there for 2 dys, I kept telling myseld that i took it out, quit worrying about it, but ii had t check & there it was. looking grey, I had put it in after i spotted very very lightly 2 days earlier, not even enought for a panty liner. but on the i put in a tampon cuz i had wiped & saw a bit more spotting. i was certain it was aunt flow. But wouldnt i have bled through my lost tampong, it got lost. i shoulve gotten a full blown period on the 4th, it is now the 13th. So i am wondering if by doin that, could it have stopped my period. i did feel fine, didnt even have cramps from it, & no iinfection. but and that was on the April 6th when i removed it. well since the 10th i have been having cramps, i still consider myself not to have a period cause if i had, then i believe blood would been on the tampon or i would've leaked. the cramps are speratic, lower back pain...But i wouldve had to get pregnant a week b4 my period. is that normal..also have a lil gas in my stomach area, like bubbly feeling. if that makes since. can someone plz tell me?