Ok, hypothetical situation.
Someone needs to take birth control, and has no other options. Yet she still wishes to have relations with her husband. What if she abstains on ovulation days (Catholics support the "rhythm method", and now you know which days these will be thanks to the pill), and also used other precautions, such as a condom or diaphragm? The pill would then never be an abortificant.
Is that ok?
Your example is flawed because no one has to take an abortive with no other options.
Look- I had to take morphine for menstrual pain- I'd miss school and work...Lie in bed doped out of my mind with a heating pad. I NEEDED something so I could have a normal life. Birth control was the easy answer, but since I hate abortion and abortives so much, I refused to take it despite the fact that it couldn't abort in my case since I wasn't having sex. I didn't want to own an abortive, let alone take one- and give money to line the pockets of people who make them.
So I had incentive to look for options. Your fiance didn't. That fixed it and that was it for her. Because she didn't feel the need to keep exploring, DOES NOT MEAN THERE ARE NOT ALTERNATIVES. You are positive there aren't any without bothering to look deeper. I begged several doctors for alternatives and they told me their were none- Doctors. I refused to beleive them, because I was in pain. They thought no alternatives existed because they had no incentive to look. My Catholic doctor did, and we found "Ponstel", my personal miracle drug. I'm all better now (except during my period, when I still have to take painkillers)
If she (your fiance) can conceive, I can almost assure you that her cycles with regulate and the pain will get so much better. My mom was like me- and after she had her first baby, she evened out. This is common.
To answer your question--I'm opposed to anything abortive. Your rubber, spermicide, etc. doesn't kill anyone. While I wouldn't use any of them myself, you aren't hurting anyone if you do.