Should i test a couple days before my period or after? I have 2 tests.

Isabel • Hawaiian/Mexican/Portuguese ❤
I've been having light cramping, feeling nauseated, always hungry, and feeling dizzy. My boobs are not so tender rn. But I been having diarrhea all the time. .. Getting headaches. My stomach hurts. Feels like my Blatter is full but not when I peed , I'm seeing constantly. Any ideas? I'm supposed to start the 8th so let me know