it took me 6 months to feel it really kicked in, but I did relapse twice in that time. I too felt discouraged but I realised in hindsight the relapses I did have didn't last as long. Previous to that I could have up to 2 years post-relapse with some symptoms whereas on Copaxone, even in the first 6 months, I felt most of the symptoms lifted much quicker after the intense relapse stage.
I suppose if you change your mind about ttc then at least you will have 6 months of the Copaxone in your system. And if you go ahead with your plan to ttc, then maybe the Copaxone will have given you a little protection during that time - though admittedly it sounds like it hasn't yet for you.
I came off Copaxone 3 months before conceiving my son and by the 3 month stage the MS was starting to rev up again for me. Then the pregnancy seemed to damp it down again. I went back on Copaxone 2 weeks after giving birth and now 6 months later I had a relapse, but again, it has not been as severe and I have recovered quicker than I did years ago.
I hope Copaxone works for you soon.