Not sure when to test...

Mackenzie • Baby boy born 9/6/18 & 1/18/21 💙💙
So I got a peak OPK on June 30, according to CM I ovulated on July 2. I am only 9 DPO now, but my period was due yesterday according to glow and didn't show. 
I am having lower back aches (similar to AF) but my cm is still very creamy. 
I have also had terrible diarrhea for the past two weeks. (I eat very healthy and drink plenty of water) 
Should I test because of missed period or wait?