Back to back pregnancies??

Anyone else having back to back pregnancies? When my baby girl is born, my youngest son will be 14 months. I got pregnant after a HEAVY period, three days not period, and a week of spotting. I'm thinking that I got pregnant during the three days I wasn't bleeding and the spotting for a week was implantation bleeding. My youngest son was 5 months old. Lol. I count it as a miracle because I wasn't suppose to have any more babies after my oldest, now 6 years old. I had a miscarriage, ruptured ectopic, and a corneal pregnancy before getting pregnant with my youngest son in June 2014. At that time, I had less than 20% chance of getting pregnant naturally. My good ovary had no tube and my bad ovary didn't function.