If I chose to marry some one who I knew was going to use contraception, then I believe I would be guilty of mortal sin because:
- it is grave matter
- I knew about it before hand
- I agreed to it anyway by choosing to marry that person.
Forcing me to accept contraception in my relationship would be a deal breaker for me. I would be unequaly yoked, which the Bible and Church teaches us to avoid.
If I know my spouse is going to contracept then I open myself to all the types she may choose. The shot, and the pill, are abortifacients. They will cause your conceived children to die. The IUD also causes spontaneous abortions… Women who use contraception have been know to have abortions when they “accidently” get pregnant anyway. **They feel it’s their right to have the abortion even when their husband disagrees. **I’ve seen it happen several times. It’s a heart breaking place to be, and was very traumatic to the men. They all ended in divorce. Imagine fielding that question, “Daddy why did you & mommy get divorced?” It is so incredibly sad. I would not wish that on anyone.
Hopefully the OP will be able to work out this contraception issue. Perhaps she has an interest in the Church? Once she learns more about the harmful effects of contraception. It kills hundreds of women each year, she may be open to learning about the wonderful, healthy method of NFP.