Increase in PSA after pellet testosterone therapy

I recently underwent testosterone therapy with placement of pellets. My PSA prior was in the 1.6 range and weeks after implantation my PSA has increased to 2.5. This is a little worrisome to me and wondering if anyone else has experienced the increase. I've yet to return to my urologist for follow-up. I will add that the pellet therapy has been positive in that it has increased my libido and seemingly has given me more energy and overall feeling better. It is a little difficult to differentiate as to whether it is as a result of this or implantation of a pacemaker a little over 2 weeks ago for heart related electrical issues. I might also add that my heart is strong according to the cardiologists and there's no evidence of any damage to it. I did have stent placement a little over 3 years ago for an 80 plus percent blockage of the lad.