pregnancy

So according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> my period should have started the 9th of this month. So far since I've used it, it's been pretty accurate. I'm on what should be day 4 of my period and have not started it yet. I've taken pregnancy tests and they've shown up negative. My PMS symptoms started 2 weeks before I was supposed to start my period and I still have symptoms. I am cramping. I feel like I'm going to start my period everyday but it just hasn't come yet. I'm debating calling my doctor. I just wanna wait until I've missed my entire period. I'm not under any terrible stress where it would delay my period. I feel like something is off. I'm just curious what others would do in my situation cause idk what's wrong.