I am lucky. DH and I must be very fertile.
DS1 one month after stopping hormonal BC.
Angel baby I had my mirena taken out, one bleed, then pregnant next cycle.
DS2 immediately after miscarriage. I never even had a period in between.
DD two cycles after mirena taken out.
I stayed off of birth control after DD and used natural family planning. I tracked my cycles and used a backup of a diaphragm during fertile weeks. I successfully avoided pregnancy for 3 1/2 years. We then decided to try for baby 4. I did not use protection during my fertile week and we got pregnant the first try just 5 days after we decided to try for the baby.