How effectictive is contraceptive film against pregnancy?

My partner and I both dislike condoms and I'm unable to use hormonal birth control.I'n considering using contraceptive film,the pull-out method,and not having sex while I'm ovulating.In my opinion this seems good because if the pre-ejaculatory fluid does contain semen then it'll be blocked by the spermicide and there also won't be an egg for it to fertilize to begin with.Howver my partner wants an outside opinion?Does anyone know the effectiveness of this method?Also how effective is contraceptive film to begin with?I've heard many different percentages.All answers are appreciated thanyou.