Go to L&d or no?

Ashlie
For the past 3-4 days I've been having period like cramping in my lower back and belly, with occasional leg cramps.
They have been getting more intense  over the past few days... 
I've been drinking loads of water and even when I rest, I feel them. 
They haven't been so bad that they wake me up for a deep sleep, but I do notice them all throughout the day, with tightening as well. 
This is my 3rd baby, and she feels very low to me. 
Should I be concerned or no?