Abnormal Period

Kiandra

So last month I was very light but this month it has been a mess. I have been very heavy and normally I don't bleed in my sleep or as soon as I get out the shower but this cycle I have been. Has anyone else had a problem like this, and is it normal? Should my period also shorten this month? I'm also in school and I don't have time to leave classes to change my tampon/pad every 2 hrs...any suggestions?