Should I wait for FMU tomorrow or can I take a test today?

Period is due on Sunday. I used my last pregnancy test yesterday (10 dpo) with FMU and I got a faint line that I couldn't tell if it was an indent, evap, or what. I ordered more tests (FRER) that are coming today from Amazon. Do you think I could jump the gun and take it when it gets here, or should I wait until my FMU tomorrow?