41 weeks pregnant. Went in for a NST today and they said I was having regular strong contractions 4 minutes apart. But I couldn't feel anything. They checked and my cervix wasn't 100% effaced and still closed. They sent me home. 2 hrs ago I started to feel them. They just feel tight not painful every 4 minutes lasting a minute. They are a bit tighter now than when I first could feel them. So in total 4.5hrs now of consistent contractions. Are these Braxton hicks?