Late period am I pregnant?

Hey guys so it's been a month since my last period and I am now 9 days late on my period. I'm not birth control. My boyfriend sometimes wears condoms and most of the time does the pull out method. On my last period it only lasted 2 days but it wasn't heavy bleeding it was mostly spotting. Ive been having frequent headaches. Last weekend I ordered Chinese food with my boyfriend and I usually eat everything on my plate but I only ate 3 bites of my food and then my stomach started hurting bad and I felt like I had to throw up. Today I went to whataburger with my family and I told them that it smelled like vomit inside the restraunt and they couldn't smell what I was smelling. I'm not sure if the plan b pill I bought 3 months stopped my period completely or if I really am pregnant. Please help me. Any reasonings?

Current update: I'm still having symptoms of me smelling unusual things. I still have bad migraines but now I'm experiencing vaginal pain. It's like the pain that you feel like if your about to start your period, but I still haven't gotten my period yet. My weight has also been up and down. It's been 13 days late now for my period. Any suggestions of when I should take a pregnancy test?