pains in early pregnancy, what is normal?

Emilia
So last night I had pains, sort of cramp but then some pains that weren't like cramps but not exactly sharp either. Lasting for about an hour/two in my stomach. I've had no bleeding or any other symptoms and I'm around 5 weeks pregnant, and this is my second baby. is this normal and just my body preparing for a baby? 
I'm calling the midwife in the morning as its bank holiday in the uk and they are closed today. 

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