Recurrent utis

I never really got utis before I got my Mirena in June, and now I have probably gotten 8-10 since, usually after I have sex. I do everything to prevent them. I’m so annoyed because my doctor says the iud cannot cause UTIs except I’ve seen other women sharing their similar experiences. I’m getting so frustrated because I think it’s bothering my bladder and it feels like I haven’t felt normal since before my iud. Does anyone have a similar experience?