I haven't had a cycle in 2 months?

All four pregnancy test including a blood test have come back negative. My doctor states its hormone stress, plus the worries about being pregnant. I had some pregnancy symptoms about a month ago then it all went away. I currently feel normal haven't been sick or sleepy. My question is could stress really delay your period this long, and has anyone been two months late, negative test but still ended up pregnant? I have NEVER in life been two months late without being pregnant. I've had so much other stress in my life going on, such as divorce and all the things that comes along with that and it has never delayed my cycle this long. Any answers....just curious??