Confused Of Implantation or Period Bleeding...

I had heavy and sometime light bleeding for 7 days til Now after 8 days late period.. I have all the early pregnancy sympthom but I tried many time test pack but still negative sign..
Also check with USG no sign of yolk sac and fetus at all but the doctor saw tiny little cyst...which is scare me...
And I tried took B-hcg blood test and in 2 days the result done..
I just courius it is implantation bleeding...
or 
I just have late period... 
As i waiting to get pregnant for 4 years now...
Everything so confusing
My LMP was 10/9/14 and I was ML on september date 24/24/27 and 1st oct..
Did anyone had the same problem like me... 
Sorry my english and Thank You

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