I thought someone in this thread might know something about this. I've always had irregular periods since puberty. The length varies drastically . Some months I'll have nice 30 day cycles for a few goes. Then it will be 48 days before my next period. I can never tell. Years ago when I was about 16 I had blood tests for pcos and they came back clear. As I have all the symptoms ( including acne, excess hair, weight gain) my doctor referred me for a scan recently. I was taking soy isoflavones at the time and typically that month I had a nice short cycle. The lady performing the scan stated she could see no evidence of pco and she could tell from my ovary I ovulated that month. Since then my cycles are all over the place. I've never been pregnant after having a lot of unprotected intercourse in the last few years ( not trying not preventing). And even though I haven't been actively trying for long I have a real gut feeling there is something causing my irregular periods. I did think I was being irrational at first, but I honestly can't understand why else my period is so irregular? Anyone have any ideas?