uh oh

Uh oh. . . 
My husband and I a little time to ourselves today and we ended up having a little too much fun. He ended up finishing inside me. My issue is, I'm not sure if and when I'm ovulating. I've been ebf for the past 9 months and have only had a period for the months of Oct, Dec, Feb, and March. If I do end up getting pregnant, my kids will be 1.5 (18 months) years apart. I always pictured myself having kids 3 years apart, atleast. Anyway, anyone here with kids 18 months apart? Is it easier or harder having kids so close in age?? I will keep you guys updated on the outcome...