Question about the effectiveness of the contraceptive implant?

I suffer from self-harm, and since I knew I was having my rod removed in a few weeks, I couldn't resist the urge to self-harm myself, so I cut myself lengthwise. I immediately went to the hospital to get it stitched up, but they noticed that my rod had already been exposed in one place. They left it in and simply sewed it up.

After 10 days I had unprotected sex, could something have happened, normally not or was inside the whole time continuously