Implanon
"I've had my implant for going on three years.  During the first year every few months I would have urinary tract/bladder infection like symptoms.  I would go to the doctor and they would prescribe me antibiotics then it would go away.  By the third time having these experiences I waited to see the doctor to tell them my concerns.  I felt like I was someone was squeezing my bladder it would get tight and get loose and I would have to take a moment to stop and let the pain go away.  When speaking to the doctors about this they say it's "pelvic pain" I've never experienced this in the past with any birth control I've been on the iud non estrogen and estrogen, pill, and patch.  Periods come around the same time every month and spotting occurs."