I think this happens when you don't ovulate. If you have already got a pregnancy test done, I would recommend you go to the doctor and get it checked as it is very important for you to get your periods on time.. I wish you luck!!
Yes it is. I was watching a show on the TLC channel and there was a lady on there that has never had a period and she ended up pregnant. The show is called I Didn't know I Was Pregnant. You can got to www.TLC.com and watch the clips. Good luch and I hope this helped.