Stitches come open 😩

Tiff • Baby number 2 is on the way.
5 and a half weeks postpartum and noticed my stitches have popped open in the middle of my Perinium 😭 now I know it's there I can feel the pain, apparently it won't require more stitches but will heal itself...sounds a bit weird to me but I have my 6 weeks check up on Thursday so will find out then.
Anyone else had this?