Bfn again

AF is suppose to show her face tomorrow but my so and I bd'd 4 days out of my fertile window. I'm 7dpo right now. I have really sore boobs specially on the side closest to my armpit, the almost feel like they are swollen or getting bigger. I've had creamy white cm (a medium amount of it), had headaches the last three days, and have had bm and has more the last three days the normal (tmi) but when testing today I still got a BFN. Should I count myself out at this point and just stop testing or is it still a possibility for me to get a BFP