12DPO still BFN. Is BFP still possible

hi ladies, 

i have three boys that were born over three years. Really felt like one big pregnancy. I wasn't trying to get pregnant with them so it always came as a surprise especially since I was either on bc or I had taken the morning after pill. I never recorded any symptoms that I may have been having so now that I'm actually trying to conceive I'm going crazy with symptom checking. 

I have had cramping off and on since 2/3 dpo

cold like symptoms (sneezing, runny nose, fatigue) since about 5dpo

nipple sensitivity off and on

heightened sense of smell

certain images make me nauseated 

my temp has been between 99.2 and 100.3 since 6dpo

i feel emotional and get agitated easily. 

Ive been testing since 8dpo and all were BFN. 

should  still continue to hope? My AF is due on Tuesday (Aug 29). I tested last night around midnight and it was still BFN