Back Pain. Could it be labour?

[Tinks]

I'm asking this on behalf of my sister who is about 36ish weeks pregnant.

This is going to be scattered because I am exhausted, just got home from work and can't function but need some opinions.

She was told she is having contractions but said she couldn't feel them, she has a really sore back which she didn't mention to the dr so they sent her home. I've just spoken to her and she says she feels 'off'. She's irritable and the pain in her back is getting worse. I suggested it could be labour but she doesn't think so because it isn't anything like her 1st one.

Do you ladies think it could be the beginning of labour?