when to go off the pill


my husband and I have decided to try for baby number 2! our daughter will be 6 in July and we have been a happy family of 3 all this time and then suddenly we both got baby fever! with my daughter I was off the pill for about 3 months and not really trying when I got pregnant (I was 25 at the time, now 31). I'm on the pill now but wondering when I should stop. Ideally I'd like to conceive in the fall so we could all enjoy the new baby over summer break 2019. what are your thoughts? stop at the end of the month of should I wait awhile longer?