someone explain please

Natty πŸ’…πŸ€—

so I had unprotected sex about 2 weeks ago I did a test after two days which came out as negative but I still took plan B. my period is now 10 days late. since last week I'm feeling super nauseous, tired and I eat a lot, whereas usually all of this doesn't happen. is it possible I am pregnant although I took the "day after" pill?