When to call?

At what point do you call the midwife because you think you’re in labour but have no idea? My mum (and yes I know I could be completely different) didn’t lose her mucus plug, and had to have her waters broken in hospital as all she had to show I was on the way was pains, tightenings and backache, after her waters were broken I came 2 hours later!! But I have the exact same now for a good 24 hours also, back is killing me, tummy is constantly tightening and painful, but nothing is consistent and regular, plus no mucus plug. Do I just asked to be assessed, even just to put my mind at ease if it’s nothing? I hate the not knowing and also not wanting to be a burden 🙈