Help?

I'm 22 years old and usually have a heavy 7 day period. My last period was lighter than ever (looked bright pink red) and only lasted for 5 days. I haven't put much thought into it but lately I've been having food cravings and dislikes to foods I usually enjoy. I experienced nausea a couple of times but today was the first its happened in the morning (around 9am). My next period is due the 26th. Could I be pregnant?