It took me 5 years to have my son. why havent i got prego with my secound child. its a year in half already. not useing birth control. ?

From MAYO Clinic : Limited research suggests that a pregnancy within 12 months of giving birth is associated with an increased risk of:placental abruption, placenta previa, and Autism in the second child. In addition, a pregnancy within 18 months of giving birth is associated with an increased risk of: Low birth weight, Small size for gestationalage,andPreterm birth. Best to give it two to three years.