im scared and idk why ?!

Okay today i am suppose to start my period and this at 6 AM in the morning I put on a liner just in case I started at school. So I got out of school at 3 PM and still no period... I waited all day and nothing. Its now night time at 9 PM and still no period at all ?!! What ?! It has never done me this way before and im not stressed but its really about to worry me.😩 My last period was March 10 and my cycle is 28 days and my period lasts for 7 days. GLOW says I start today ? Wtf ? Btw , im 14 and also on BC ! 😃 Is this normal! Can someone tell me whats going on ??? I never had sex.