Late Period. Please give me some advice!

So Glow is telling me I'm 17 days late on my period. My nipples have been sore for quite some time, got acne about 10 days ago, occasionally get cramps. These symptoms have all happened throughout the course of about 10 days but still nothing. I haven't had sex (still a virgin). Should I be worried that it's this late or should I just wait a little longer?