pregnant?

Okay so I'm like 2 weeks and a few days late for my period. The last first day of my last period was March 1st. Me and my boyfriend had unprotected sex on March 17th. Lately I've been feeling super nauseas and everything smells funny to me. I couldn't even stay at work today because the different smells were making me want to hurl my heart out. I've also been super tired and my breasts have been extremely sore. And I've been starving like so much I could just eat and I'm starving again. I'm thinking of taking a pregnancy test tomorrow . My period has never ever been this late before especially because I was ovulating when me and my boyfriend did it. So is there a possibility I could be pregnant? If I were pregnant wouldn't that make me about 6 weeks ? Should I be showing if I am ?