what could be wrong?

July 17th was my last period! I tested on August it was negative but haven't tested since then, I am irregular I've gone 1 month without a period but never this long. I have been trying to conceive for the past 3 years and I'm scared to test again knowing the fact that I'm most likely not pregnant because it's been very difficult, my only symptoms are white cm and slight tender breast but Not really hurting. I am going to start to see a specialist very soon I'm just scared of what could possibly be wrong. What do you ladies think of my situation? Thank you all so much for your help!