TTC while breastfeeding

Josie
Does anyone here have experience TTC while breastfeeding? I didn't get my period until my daughter was 18 months old and my cycle is still all over the place. We are down to about a 30 minutes a day total (3 10 min feeds). I don't really want to stop before she's ready but I would like a 2.5 to 3 year gap between kids. Any advice is appreciated.