Back labour?

Laura • 2 beautiful boys. East Yorkshire England 💚
Did anyone have back labour??? 
I'm high risk for preterm labour, all day I've been having a sharp shooting pain up my vagina, and then tonight I'm getting a COLD/ACHEY period feeling in lower back that's coming and going... I'm going all hot and flustered .. No UTI or anything as I got tested today, also a hell of an increase in white discharge 😩 could this be the start? Baby is tucked really deep down I'm 34 weeks, 2cm and 100% effaced since 27+4 
Please tell me this is the start!!!!!