Strange pain....

Hello! First off let me start by saying no I'm not pregnant and I don't have std's so I'm not sure what is going on.... for about the past week I have been getting a quick stabbing pain in what feels like my uterus. Last night I cramped for a little while but that was the first time I've had any other pain. I have the nexplanon implant in my arm and its due to come out in a few months so could it somehow be from that?? Has anyone else experienced this and if so did you find out the cause?? Thanks!!