I got my period back 4 months pp and baby girl is now 12 months old and eating 3 meals a day but still bf a lot (1-2X at night and maybe 4-5X in the day).

We’ve been using the app to track my period and ovulation window and causally ttc since last November, and trying harder since January. My cycles have been 26, 29, 31, 25 and 28 days long since Jan - does this mean they’re irregular? I’m on day 29 this month and two pregnancy tests have been negative which is so disappointing even though I guess it’s normal considering I still breastfeed multiple times a day, but we had sex 8 days out of 10 in the middle of my cycle. I’ll be sad to wean my baby before she naturally wants to but is this what I need to do to improve my chances of conceiving soon?