Ureaplasma

I'm sorry I hope I spelt that right... So I just found out today that I have Ureaplasma, still. They told me I first had this bacterial infection about 5 months ago. My hubby and I took our z-packs and abstained. Then I went back about 2 months later and found out we still had it. So once again we both took our z-packs and abstained for longer this time. I went into the Dr last week and they called me today telling me I still have it. Why is it so hard for me to get rid of this?? Anyone else ever have this infection or issues with it? My Dr said that this is something that can definitely prevent pregnancy and since we are TTC I'm getting very frustrated. Advice from anyone?