Lost.

I was supposed to start my period on the 31(Friday) it never came and glow said it will start in 2 days meaning (Sunday) the 2nd and it never did so then glow said it would come 2 days later again. (Being today) and it has yet to come. I took a test yesterday and it said negative. My boobs are sore as can be and have been for over a week. I have also had a little cramping but as soon as I get a cramp its small and doesn't last long, and I usually poop right after(tmi). This has happened maybe 7 times in a week. Are they normal period cramps? I don't know what to do or when to test again? Help?