TTC for more than a year...😢

My boyfriend and I have been trying for a year now and have not been having any luck. I am 25 and have been off birth control for a little over a year, I have been wanting a child since I was about 12 years old. My periods are still not regular so when I think I am a week late I start getting excited but always get a negative test. Yesterday I had a bout of diarrhea in the morning and was fine the rest of the day, thought it was a little weird since I'm usually backed up. Didn't think anything of it. Today I had some brown discharge and have had another bout of diarrhea..I was just reading this could be an early symptom. I have also been very tired at work and almost falling asleep. Everytime I have a slight symptom I start getting excited but try not to jump to any conclusions because I am usually let down. I am really hoping this is it but I want to wait a few more days before I take a test. There is nothing more that I want than to be pregnant!!