so much poop😩

so my period is due in 5 days. i have been cramping since ovulation and been sooo exhausted. the past few days i have been extremely nauseous, gassy, and this morning i pooped so much in one sitting than I ever have in my life😩 lol is this an early pregnancy symptom by chance? it wasn't diarrhea or anything, just lots and lots of moderately healthy looking poo😂 also, if i test on thursday (3days before period) how likely is it that i can get a positive?