Help with Labour symptoms

Helen • I am 30 yrs old. Been with my partner 5yrs. He is a guitar teacher and I am a home carer. Bought our first house last year. Now have our first child. A son named Harvey born 27/10/3016
How can I tell the difference between early labour and growth pains or baby sat awkwardly? I have been getting slight (very slight) waves of pain across my tummy and back. Putting pressure on my right ribs. I am still working as my maternity doesn't start for another 2 days but I am a lone worker as a home carer. I also have the feeling of needing to poo. What should I do?