IS IT TOO EARLY?!

It's currently 11:32 pm, July 16th. My period is apparently due tomorrow, July 17th, according to Glow. I'm only 10 DPO though... is it too early to test?? I've had sore nipples the last few days and I've also had a lotttttt of discharge. Which are both PMS symptoms. Advice?!?!?!