On the pill, possible implantation bleed, cramps + bloatedne

I took the last pill of my pack of contraceptive pill (the combination pill) three + a half weeks ago. I had a dark brown bleed (very light in terms of flow) about three days later, and it was much shorter than my normal bleed (lasted about 24 hours, my normal bleed lasts about three days). I experienced quite bad bloatedness from this time, and for the following ten days or so. I also had mild cramp in my lower abdomen on both sides for a week or so following the short bleed, much lower in my abdomen than period cramp I've felt before, and mild but sharp pain in one of my breasts. I also had quite bad heartburn and was burping alot (!) during this time following my bleed. These symptoms have mostly subsided now, except for the occasional feeling of mild cramp/mild burning sensation in my lower abdomen. Also, I've had almost no vaginal discharge in my knickers for the last couple of weeks, which is really unusual for me. I carried out a Clearblue pregnancy test 7 days ago (as recommended by my doctor the week before), and again 3 days ago, and both were negative. I've convinced myself that I might be pregnant (possibly from spending too much time Googling symtoms!!). Can anyone relate to any of this? Thanks.