Should I test?

Hi everyone. Im on month 7 TTC. my periods usually last 3-4 days. Well this months AF (November 2) only lasted a day and a half. Thats never happened to me. Every since then ive taken 2 dollar tree tests and BFN! I have heartburn (which isnt normal for me) loose stool (sorry tmi) headaches, im not sure about fatigue... I havent noticed anything except some days I tend to want to sleep all day. And some tiny tiny cramps every once in a while. My cravings havent changed. Should I test again? This is soooooooo confusing. Im 20 TTC #1. Thanks in advance.