Best safe form of birth control

So I just had my daughter a week ago and I'm already concerned with getting on birth control even though I haven't had my first period after giving birth. I'm stuck. I like the shot but after doing some research on it I'm concerned that it may cause problems with fertility in the future. And I've just heard several bad things about it. I like the pill but I hear several stories of woman getting pregnant while on it. Sooo my question is what is a good form of birth control that is also safe. I am very intrested in an IUD but people keep scaring me with horror stories. Sooo confusing!!! Help please.