Implementation or period?

Hello, I have a regular 29 day cycle and I have been trying for a month 1/2 to get pregnant. My period was due on the 5th of December, I have had all pregnancy symptoms, mood swings , sore nipples , fatigue but today 12/8 I woke up at 5 am and noticed heavy bleeding ? I was sure enough that I was pregnant . Could I still be? I don't understand