I would pull it out whilst the incision is still fresh.
then
Inspect it the best you can, take photos, microscope, Ticket to DT 
Play with the connection once it’s outside of you. DT may want it back for their own inspection.
Maybe @tac0s could arrange a replacement from KSEC so you can get a new one in you faster and before the wound closes.
Better yet, remove it once you get the replacement …
Did you notice any issues during your pre-installation testing, that now, looking back, could have been a sign that all was not perfect?
EDIT:
My UG4 is still going strong, but I would say, It is not my best reading implant.
A little slow and the range is less than similar form factor ApexFlex.
My phone would read it without a MFGC, but only just.
Mine is in P4-L