Weaning a 10mo?

My little one is 10 months old and nurses 3-5 times a day with 4 being his most typical day. I’ve had 3 pp periods now while breastfeeding. The second period I ovulate 5 days before starting af and the third was 7 days. This is obviously a problem for TTC. I do supplement with HiPP formula 3x a day (~12 ounces) because I have a lower supply than what he needs and I have ample formula on hand if I was to switch him to fully on formula before a year old. We’ve been wanting another baby since he was 3 months old and we both get heart broken with every negative. Any support or thoughts out there?