I have been tracking the dates of my periods and there is a specific pattern to my periods. My periods alternate between being 28 days and 31 days apart. This happens consistently every month. One month is 28 days between periods, the next is 31, the one after that is 28, the one after that is 31 days apart. It's always the same.

I thought maybe this could be because I heard that ovaries alternate each month, maybe my left one is the one that is 28 day cycle and the right ovary is the one causing the 31 day cycle?

Is this abnormal? I was scared in case it had something to do with my "abnormality". My mum has uterus didelphys [google it, it means you have double the amount of reproductive organs] and I suspect that I have the same thing.

I had a scan to see about the uterus thing but they couldn't see very well and they sent me a letter saying "Your pelvis looks fine" I don't trust these results as the woman being scanned after me in the hospital was having a pelvis scan. Being a hospital my results should have referred to the uterus or something, not pelvis.