Please help!! Have you experienced this?

Carrie
So my cycle is being really confusing and weird on oct 12th I had really light bleeding and the stopped completely for two days then on the 15th I started bleeding again it was pretty light as well but heavier then the 12th but again light I would only notice when I wipe (sorry if tmi) so anyway it continued the same for day 16 then day 17 came around in the a.m I went to do FMU and lots o
f blood came out along with a nickel size dark strechy mucus like stuff so I thought it was AF starting but it only lasted until 18th stop completely around the evening of the 18th (yesterday) so I'm confused because to day this a.m i went to pee and with some tissue and my finger I pushed up in the cervix (did this yesterday when I completely stopped bleeding) to see if any more  blood and to my surprise there was but very light pinkish could this be implanation bleeding? Anyone else have this experience and then get a BFP? I tested and still bfn :( also im not suppose to get my period until the 21st