I'm 37+5 wks and spent most of last night awake with period type cramping and lower back pain, today I've had to do a fair bit of walking due to my car deciding to break down on me (just what I need!). For the last 2-3 hours I've been getting pressure like I really need to go to the loo (bowels not bladder) and getting tightenings which are quite sharp and lasting 20-30 seconds. Is this the start of labour or am I over thinking it, as baby is still really active too