Welcome to Lifesupporters Laura, you'll find an official welcome posted
here.
As for your issue with your fiance, I believe you have every reason to worry. I can understand that a pregnancy scare can cause some turmoil in the back of your minds but putting conditions (that you have no say in) on when you return to your physical intimacy isn't fair IMO. You both should be able to sit down and express your feelings and come to an amicable solution
together. I worry that, once married. he may start calling the shots and giving you less and less choices. I could be wrong on this, but to me marriage is a partnership that takes two people to make work, not one person barking out orders. If that's the case then you may as well dump him now, join the army, and get bossed around by a drill seargent.
Many men fear the use of the condom, I was one too in my younger days. There really not that bad and there's many available options out there for you both to try. The fact that he's unwilling to even try concerns me a bit as well. Wouldn't you do nearly anything for the woman you love, especially less than 5 months away from marriage? Also, if he's witholding sex, how is the wedding night going to go? Wedding, party, first married dance, friends, family, off to the honeymoon, no sex, hey babe, lets watch telervision.
Personally, I'd sit him down and tell your side of the story. Impress upon him that you too have needs and your concerned that he's not considering them. This worry alone can cast a seed of doubt that can grow and get uglier far into the marriage. Personally, I wouldn't let it take hold, sit him down and discuss it thouroughly.
At least, that's what I'd do.
Thanks for posting Laura, and again, welcome!