Pregnant again??

How likely is it to get pregnant when you are 3 months postpartum? I have a 3 month old almost 4 months. I EBF. I was told for the first 3 months or so breastfeeding is birth control... but i just feel off like i did this time last year.. I havent started my period yet. So i have no idea if i have ovulated as i havent been looking for symptoms.