If I'm 14 weeks pregnant didn't I get pregnant mid February?

So my new boyfriend is trying to say me being 14 weeks pregnant means i was messing around while talking to him in late February! KEEP in mind I said we started talking LATE feb. He was dating someone up until Valentine's Day. I'm just so confused on how he's putting everything together in his head. I conceived around the 12th. Which means from then til now May 23 I am just a little over 3 months. Right or wrong?