Feeling pregnant but BFN test! HELP!!

Ok guys so my boyfriend and I have been trying for about 8-9 months now and my last cycle I was 3 days late and a couple days before that I had some brown to pinkish spotting, as this has never happened to me of course I looked up "spotting in between periods" and got implantation bleeding as a lot of the answers! I took a test and got a BFN the 4 days later came my period, I feel pregnant still and have really sore boobs and really nauseous and moody all the time, iv never had period symptoms last this long after a period and keep getting a BFN!! I feel like I am going crazy someone please help!!!!!