Poked with used needle

I was at work today and as I was putting a used HPV9 vaccine into the sharps container. I accidentally poked my middle finger with the used needle.. I immediately went to workers comp clinic and got blood work done and explain to them what happened. They gave me PEP Emtricitabine - TENOFV200 as a medication. The patient was a nine year-old male I think probability wise I am most likely OK. Do you think it’s worth taking this medication? I heard the side effects can be really bad.