could i have crohn's disease?

Im 22 years old and have had rectal bleeding for about 7 months, bad canker sores, and mild diarrhea and thought that it could be crohn's disease. I went to the doctor for these symptoms and had a colonoscopy done and the doctor said my colonoscopy was normal except for some inflammation in my colon. I had blood tests to see if i had ulcerative colitis or crohn's disease but they came back negative. I still have to go back to my doctor to see what else it could be and have more tests done. Has anybody had these symptoms also??