Please clarify, you had a tubal ligation on your other ovary?
If so, at present you won't get pregnant. It is not your fiancee, it is you. With a tubal ligation the eggs in that ovary can't be fertilized so you can't get pregnant. They are "cut off" from the uterus.
There may be options however. It is possible to have the tubal ligation reversed but the outcome depends upon how the tubal ligation was performed and how much scarring is present. The other option would be In-Vitro fertilization. One of your eggs would be harvested, fertilized with your fiancee's sperm, and implanted into your uterus.
See a fertility specialist.
Good luck, hope it helps.