Single touch payroll - mid year to date reports

I have just set up Single Touch Payroll to ensure its up and running for July 1, 2019 (I have under 20 staff).  I have submitted my last 2 pays which seemed to work perfect.  My question is as I have started mid year (and I am not obligated to submit yet, just did it to ensure it worked and I could iron out any bugs early on) am I still meant to inform ATO of previous payrolls from July 1 2018 up to Jan 2019, or do I not have to worry.