So my period was supposed to start 4/21 but it hasn't. I took a pregnancy test 4/22 but it was negative. After updating Glow, it said that it was supposed to start today. Had sex with my partner just to see if he would "knock it on" but still nothing. It's not normal for my period to be late. We believe I'm pregnant but that negative test got us straddling the fence. Advice anyone?