My doctor wants to put my on this prophylacticlly, as I have had 4 UTIs in 6 months. Right now I'm on Ortho Cyclen, and am worried about the effect it will have on my pill. I'm in a monogamous, long term (i.e. talking marriage) relationship, and immensely dislike condoms. I'm considering an IUD, but am not ready to take the plunge yet. Do I need to worry about my pill not working?