Late Menstrual Period, nausea, and mild cramping?

I'm a 16 year old VIRGIN girl that been getting her period every month for the past 5 years up until now. This up coming friday will make it 6 weeks since my last period. I've also been experiencing mild cramping for the last 2 weeks which i though was the onset of my period but nothing has happened. I've also been nauseous every morning and i've had an increase in l discharge and sensitivity, just crossing my legs gets me . Any ideas on what this might be?