Close age babies

I grew up as mostly an only child( long story). My #1 came much earlier because they told me I couldn't have any children. I was 22 at the time and was upset about it not to mention I had just had a ectopic. After the ectopic they took me of my pill and 7 months later I was prego again. My dr didn't believe it. Now I have a perfect 15 month old baby boy. I've always wanted two kids close in age. Any recommendations? How long can it take to get prego again?