Random cramp in the night??

I’m 40+1 weeks and last night in bed I had an excruciating cramping pain in my stomach that I was sure was a contraction because this will be my second baby and it was definitely stronger than a Braxton Hicks but I’ve had no more pains today like it. Does anyone know why? I really thought that was it but then literally nothing else has happened! I’ve not lost my plug and my waters haven’t broke so I’m so confused 😩