Help PLEASE!!

I'm supposed to get my period in 4 days but the last two months I got it every 15 days and it has been 23 days since that last period and I still don't have it. I'm on the pill and take it on time everyday, but one this month I took it an hour late. I've been super hungry, bloated, boobs hurt and nipples are darker then what I remember. I'm really scared, some one please shed some light on this situation to help me better understand.