Heartburn a symptom??

Earlier tonight after eating I got mild heart burn, I never get heartburn not even when eating spicy food. I just happened to be eating cashews at the time. The only time I've ever had heartburn was when I was pregnant with my son but it was way later in the pregnancy.

I am 8dpo heres my symptoms so far.... Sore boobs, pressure and pinching in my abdomen, cramps, creamy cm, backache, crazy appetite, dizzy spells, vivid dreams and insomnia last night. Now heartburn?? Has anyone else experienced heartburn before they got their bfp?