Self employeed and need to pay cpp

Did you report net self-employment earnings of less than the basic exemption ($3500)? Did you have any employment income on which you paid CPP contributions?

My total income is under $3,500 once I enter my expenses, no other employment income that I paid CPP contributions on either

If your income from self-employment is under $3500 (and you had no employment income) you will have no CPP contributions to pay on it, as that is the basic exemption.

(When you print or save a pdf copy of your completed return, you will see the calculations on Schedule 8.)