7 DPO no sign of implantation. :(

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This is my second my of the exact same symptoms. All pregnancy like symptoms ( nausea, sore breasts, cramping, gurgling stomach, starving one minute sick the next, backache etc.) I had this 3 weeks out of the month last month and we are doing it all over again. Is anyone else going through this? It is so frustrating ttc and having symptoms but getting BFNS.