Day 16 - Premature Ejaculation

I had intended on hardmode as I'm currently single but last night an opportunity presented itself and I wasn't going to say no. I brought a girl home from the bar and literally came as soon as the D hit the P. Mind you this has never been a problem for me when I was fapping, I lasted great and always stayed at max hardness. It was very embarrassing and I ended up explaining to her that it was not normal and due to my no fap. I had 0 control. However next morning when we woke up and went at it again I was able to control it perfectly and we had great sex. I'm worried that the longer I go in nofap the faster I'm going to be cumming when it comes to these casual encounters. Has anyone had the same problem?