Please help...

My 2 week old has been up since 11am it's now almost 5:30. He's burped and peed and pooped plenty of times today but won't stop feeding. He uses me as a pacifier but only towards the end but today he's been trying to use me all day. I'm strictly BF and wasn't gonna introduce bottle/ pacifier till 6 weeks but now my fiancé wants me to try the pacifier to see if it works. I don't want to but can't figure out what's wrong with my LO.