Can I still be pregnant?

Patient: Kathy, I am 29 yrs old I have been with my bf for 15yrs we are engaged to be married next year. Ok so he always pulls out when we have sex. The other night he didn’t, but the very next day I got my period now my periods are always late I don’t have a regular cycle sometimes I had my period for 3 days the 2nd day it was very heavy now it is gone. Is there still a chance I could be pregnant? And if so how long should I wait before I take a test? We would be ok with having a baby so I just want to know if it is possible. Thanks I look forward to hearing from you.