I have my period but I'm nasus all the time could I be pregnet?

Not necessarily. Not necessarily, hormonal fluctuations with periods can also cause nausea. To be sure, pick up a home pregnancy test - they are inexpensive and very accurate.
Unlikely. Menses usually means you are not pregnant. A home pregnancy test is cheep, and available at many dollar stores. There are dozens of reasons you can be nauseated. You may want to call your doc and get evaluated.