Okay. So.... According to my calendar app, I was supposed to start my period yesterday. I cramped all day long and usually when I cramp I start within the hour. I didn't start. Today I am cramping again and no sign of period yet. I am never usually late and if I'm off at all I'm usually a day or 2 early. Supposedly I'm 14 dpo today. But I also have 2 other apps and one says I'm 12dpo and the other says I'm 11dpo. So. I'm confused. I know implantation can occur between 6 and 12 dpo. Could I be having implantation cramps now? I have no spotting of any sort and my breasts are normally tender from the time I ovulate until I start my period. They are tender now, but not really bad. Yesterday I had a tingling sensation in them for about a minute and then it went away. Other than that, I have no other symptoms. Anyone else experiencing this as well?