I had unprotected sex on the 4th of feb and got on the implant today. my last period started on the 22nd of jan. could i still get pregnant?

Pregnancy ?'s: With regular periods (24-32 days apart, unprotected sex on day 12 of your cycle could include ovulation, and the progestin implant will not protect against implantation reliably , as implantation may not be prevented. If your present cycle is delayed, wait until a week has passed since the due date, and obtain a serum HCG test to be certain about pregnancy.