Hi, It does happen at times. Here's a good source of information on this that I found for you. It may have all the answers you seek. All the best
This sounds very much like what happened to a friend of mine. She was young for menopause as well (as your age is actually on the young side to be fully through that)--- but had not had a period for over a year and then had one. She had one more after about 6 months after that and has now had no periods for anther year. She is 53. Your doctor can help you with blood work that would determine exactly where you are at in the menopause story. good luck and let us know!