Pay period is immaterial in when payroll is posted or when liabilities are due. Pay DATE overrides all.
As a semi-weekly contributor your pay date of Friday requires a deposit by the following Wednesday.
https://www.irs.gov/pub/irs-pdf/p3151a.pdf
The 941 totals for Q1 2019 will only include pay dates of 1/1/19-3/31/19, even if first pay in 2019 is for work weeks in 2018. That is the way it is. And your last workweek in March will be paid in the second quarter and that is when the paychecks are created and the applicable quarter for the deposit would be second quarter
QB keeps track of the proper liability per quarter and even per semi-weekly deposit rules