Single mother of 2

I had unsafe sex once in my fertile week on 01/03 ever since my ovulation date(01/05) I’ve had the symptoms of pregnancy ever since . I got what I believe was my period on the 20th that lasted 7 days but light bleeding compared to what it normally is (dark brownish red) then on the first of February I encountered sexual activities but no intercourse & on the 2 of February I got light bleeding darkish brownish red that lasted 5 days & the pregnancy symptoms never stopped but all negative pregnancy tests

I am not trying for a baby but I really am confused does anyone know what this could mean ?