TTC while breastfeeding ~ tips pls!

Hi everyone! I'm currently TTC #4 here 😄. I have an 11 yr old son, 8 yr old girl, and 8 mo old son. We want one more but...I'm still bf my son. And this is taking longer than expected. He doesn't usually eat at night, but does mostly exclusively bf during the day between meals. Had my AF like regular in Jan...then it skipped until May (super frustersting). May and Jun were pretty normal. So I'm due a visit tomorrow - still hoping though! Anyone have any pointers?