This start of labour?

Beth • 20🙋🏼 - engaged 💍 - ballet & dance 👯 - pregnant with my first 👶🏼 - my baby boy is due 10/02/2016 👣💙
Just been to the hospital because of really bad back pain and the midwife said that I was 2cm dilated and his head was very low down, so she said she thinks it's the start of labour but I'm not having any contractions so she gave me a 'bit of a sweep' and told me to come in if I start with period pains and she also said that she thinks it will be in next few days. Think the sweep will start me off? I'm 39 weeks bang on, any ideas ladies?