suggestions?

I had a d&c last August. My periods started finally getting back on track in December. The guess date on glow has been correct for my period start date. This month it didn't start on the date, and now I am 4 days late as of today. Should I keep waiting to see if my period shows? The first time I got pregnant last year, my boobs were on fire. I have no symptoms now except some pressure in my pelvic region. I felt like my period was about to start (the night before glow predicted it) which is normal, but then nothing.