Contraction

Ano feeling ng contraction mga mommies? First time mommy here. I had a case of pre-term labor 2 days ago kasi at 25 weeks, my cervix slightly opened and nagkaron ako ng brownish discharge. But I never felt any contractions or paninigas ng tummy before I went to yhe hospital. The OB nearest me that time advised me to bed rest for a week. Sabi nya, it might be polyp but she never found any polyp nung napapsmear nya ko. So I was curious how does a contraction feel? I thi k I may have a high pain tolerance kasi so I never felt anything.