My last peroid was Sept. 8th and I have a 28day cycle. We have really been trying to get pregnant, we had intercouse Sept.17th, 19th and 20th and my fertal day was Sept. 22nd. My inplantation was supposed to be Sept. 29th or 30th. I have had abdominal pains all week, kinda like a stabing feeling, it hurt above my pelvic bone. My peroid is due to come Monday Oct. 6th, but I'm thinking I could be pregnant. If all the dates work out.