11 days late BFN

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Ladies I have been late before but never gotten past 5 days. Today I am 11 days late with no sign of period, super tender breasts and a BFN on a pregnancy test! Anyone ever experience this? I am nervous about being pregnant. I had surgery this summer past to remove one tube because I had a giant cyst so I never thought I would have another baby anytime soon. Someone give me advice before I go crazy!