Hi Charlotte – I would for sure put a dressing back over it to protect it and maybe try and get into your clinic nurse tomorrow if things haven’t dried up for a wound assessment and she can give you a dressing plan or swab it should she need to make sure not down to infection
Make sure you taking things easy, twisting and bending can put added pressure on your wounds, it might of been that you turned over in bed or something, pulling the top layer of skin apart
Do let us know how you get on xx