Ok ladies.am i pregnant?please help!ttc after m/c.?

Ok im gona explain everything.i had a silent m/c and 2 d&c in august this year.me and my husband have been ttc ever since.my periods returned to a normal 25-28 cycle 6 weeks after m/c.anyway my last menstural period was on 29th nov and arrived like clockwork.then on day 13 of the cycle i had another bleed without warning but i had no pain and it wasnt as heavy as a normal period but i did have to put a pad on for the 1st day.i was so shocked as i have NEVER bled in between periods before.i tested xmas day and got a bfn.a few days ago i had a brown discharge and a tiny bit of pink blood when i wiped.i thought af was coming but it never came.this lasted a couple of days which finished on sunday.i tested with a 1st response 2day and got another bfn.i think i should be due on from sunday 4th jan as that would be day 25 of my cycle from the 2nd bleed i had.i have got lower back pain,slightly sore ,tiredness and i have a heavy creamy white discharge.what do u think?do u think my mind is playing tricks once again?babydust everyone.xx