Backache since this afternoon getting worse

So since this afternoon my lower back has been absolutely killing but I've been having a few contractions but not painful in the front but painful in my back! So I thought she was sat on a nerve so usually me and my so will get her to move by having sex, So me and my so just had sex and my vagina felt uncomfortable on the inside and kept feeling the urge to wee but was very uncomfortable and my back is still in agony and contractions continue, is this just normal being 38 weeks pregnant? Or could I be in labour (slow labour) need your help please

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