how normal is bleeding?

Sorry for the TMI, I just don't know what to think anymore.. I have very regular periods, not supposed to start for 4 more days.. 7 days before my period would come I had pink blood when I wiped and I thought for sure implantation, I had very light brown blood the following day and then nothing. Now three days last suspected implantation I have blood again, yesterday it was red for a couple hours and then it stopped now this morning it was dark and very mucousy.. now it is light and mucousy. Did I start my period? The bleeding comes on and off and I just keep getting excited and then every time I see blood I'm sad again..