I had this also but I wasn't "constipated" or anything and the first movement both times was painless and easy, just delayed. I was told it can be fairly normal for your bowels to shut up shop for birth and a period after? I wasn't on any pain relief and I only ever drink water, consider myself quite healthy. I have health based anxiety and one thing that helps me to feel safe is regular movements (daily) and I've been regular since I was a teenager lol so it freaked me out HEAPS but was no issue, after 6 days of nothing, everything was straight back to normal both times.