Most likely your not,depends how long your cycles are.this will determine when you ovulated.
call your health department they might give you a pregnancy test, you can also get them at a dollar store for a dollar. They aren't as accurate and are mostly blue dye so evaporation lines do happen and can give you a false positive. My first pregnancy i took on and it worked fine for me.
Have you missed your period? If you have i would scrounge up change and get one!