4DPO and symptoms a day after pos implantation!

Im only 4dpo and I'm having crazy nausea that comes and goes, excessive burping that wont let up and slight low abdominal tinges every once in awhile. AF isnt due until 11/26 and i dont usually get AF symptoms until a day before. What does this sound like to you? I and DH have been trying for over a year and this is the first time that symptoms have been present so soon. I also think I had an implantation occur due to a light cramping pain and a dip in bbt that went back the next day and has been rising since. Did anyone experience this that yielded a BFP? Thanks for comments!!!!