Contraction during 20 week scan

Stacey

Had my 20 week scan today and the lady saw I was having a contraction ( i didn’t feel it) but afterwards I had to see midwife and she seemed concerned, just wondering if anyone has had this before as I’m now very scared it means preterm labour as I have also been feeling pressure and the odd pains, any advice would be grateful I was told if I have bleeding or think waters have gone to go straight in.