Breastfeeding and irregular cycles

Catrina • Mommy of 1 and happily married
Any success stories of ladies getting pregnant while breastfeeding with irregular cycles? I've had two postpartum periods now but they were 46 days apart. So I don't even know if I'm fertile at all.  My so. Is 16 months old and not ready to wean yet, I don't want to force him to stop before he's ready, but I really wanted my kids to be closer together in age