trying to conceive after tubal

I'm Paige I'm 22 with 2 little girls. They are 3 and 1. During my last c section I got my tubes tied which I regret. I want to start trying for another baby. Eventually I plan to get a tubal reversal but I can't afford it yet. I want to try anyway in the mean time. I know my chances are slim but I'm not gonna give up hope. I never had problems getting pregnant before. Has anyone got any advice or has anyone fallen pregnant after having a tubal?.