Hi Me And My Boyfriend Had Kind Of Sex But

hi
me and my boyfriend had kind of sex but we did not have penetration (only the tip of it went in) and he did not ejaculate and we are sure there was no pre-cum. it went in from the back and i think it slipped into the front but if it did it was only for a few seconds ( id say 4-6 seconds) and pulled it straight out, but like i said there was no penetration and he did not ejaculate.....
so is there any chances of me being pregnant.