Worth testing again?

I’ve been having strange symptoms for the past week that have never before accompanied my period (extremely sore, swollen breast’s, odd cramping, headaches, nausea), so I decided to take a pregnancy test 2 days ago (before my missed period), which should’ve started today. It was a CVS brand digital, and it said not pregnant, but my period ALWAYS comes like clockwork. I can’t bear the heartbreak of seeing another negative test if I go buy one, but I just feel unexplainably different? Maybe wishful thinking.

So in short: if that test was negative, would it be pretty unlikely to get a positive from another or was that potentially just an unreliable test?