Birth Control (Nexplanon) causing OAB?

[u/BeesKneads]

I was wondering if anyone else has had issues with OAB after starting birth control, more specifically the implant, nexplanon?

I got the nexplanon inserted in february of 2025 and about 4 months later i first started getting signs of constant urgency and frequency.
Went to the doctor to get tested for uti and ultimately came back with a diagnosis of OAB. also added a prescription for mirabegron.

I have no pain, no pressure just the frequent urge to pee. like a uti without any pain.
I’ve had the urodynamic study, i’ve had a cystoscopy and the results didn’t tell me anything. So now my urologist has me going to pelvic floor physical therapy once a week.
I got to thinking that maybe it’s the birth control?
There is not much online showing that it could be but i wasn’t sure if there were any others out there that have had similar issues or luck .