Im usually very regular, occassionally a day or two out but very rare. I usually have sore boobs the week before my peroid, but they not sore. I cant stop crying the last few days but I am like that when pmt and also when pregant so thats no help. Wednesday I had proper period pains, not just pmt cramps, but no period. I wish we could just have an inbuilt way of knowing for sure.