Breast feeding

I have been breastfeeding my 15mo old baby only at night, I’m in the process of weaning him. I want to try again for another baby but have heard it’s “harder” when you breastfeed. I’m not breastfeeding near as much as I was in the past and again it’s only at night do you think I would have a better chance I’ve always had my period and a few days ago I thought I felt like I was ovulation. Anyone else fall pregnant while breastfeeding