Need advice.

AF was due 11/21. Had spotting on 11/20, brownish, then turned to pinkish. My periods are always on time and always three days, always have terrible cramps. I've only had light cramping, which is out of the norm. According to Glow my period should have been due today, but nothing. No spotting, nothing. I've taken tests, different brands, different times of the day. All negative. Any idea on what is going on? No negative comments please. I'm just a woman trying to start a family. But I feel so confused, discouraged and out of tune with my body.