Weight loss after pregnancy

Hey everyone this may seem like a silly post but just wanted to ask here before my doctors appointment. Pre pregnancy I was 120lbs, I’m 5’6 I put on 23lbs during my pregnancy so I was 143lbs when I went into labour at 38+4 weeks. I’m currently 4 weeks PP and down to 116lbs. Is it normal to have lost this much weight so quickly?