Painful contractions???

I'm needing help. Obviously with today being a holiday I can't just call my midwife. I'm 36+6 weeks. This morning I was sitting watching my son open his presents and all of a sudden I get this SUPER sharp knife stabbing pain that felt like it when from one hip to the other and my lady bits hurt like pressure. I have had about four of these episodes today. I had this pain when I was 31 weeks due to contractions and they gave a few rounds of potocin to stop them. Well I'm suppose to have a c in two weeks I have my pre op tomorrow. But I'm in SO much pain. I wanna cry. With my son I didn't have contractions like this, which was very weird to me at first. So this is new. Anyone experiencing this. I wanna cry.