Crazy? Or just determined?

My husband and I have been trying for around 2 years. I've had 6 losses and ended up losing 1 of my tubes last sept.. We're still trying but it seems like I just can't carry... I'm currently being tested for any issues that could be a problem but none of the simple fix issues are my issues, and we haven't found out what's wrong with me yet.. Between the cramps, random bleeding and cysts I'm worried I'll never be able to carry full term.. Are we crazy to continue trying even tho we know ill most likely lose the baby? I hear all these stories about women who are told that can't conceive or carry then do, but I feel like I'm not going to be in that group.. ): any ladies out there give birth after being told they can't???