Negative continuously!! Is it only me ??

I have had spotting almost 11 days earlier than my previous period its not normal, in january 18 immediately after intercourse! And then nothing just a tiny spot again alternate day! Then it stops off conpletely. Nd now its feb no periods nd im doing my preg test since then its negative ?! Is it only me having this issue or is there anyone faced it too what do i do?!!