Im roughly 9 DPO, calculated by glow. My monitor did not pick up a peak, only high readings. Ive been experiencing cramping and a twitching sensation in my lower abdomen. Could this be implantation? Its still pretty early to be getting period symptoms. My period is only "due" the 25th. Usually i get sore boobs a few days before, which I currently have, but only get cramping the day before. I had a 20mm follicle when i had my scan.