Pressure and cramps when walking

Kristal • Mom of two year old daughter. I live in Fairbanks AK with my fiancé. I love the summer months here. Baby #2 due 2/14/16
Today I was at the store, walking around and I started get really intense cramps and pressure. I've never had this happen with my singleton pregnacy. 
Is this normal? (I'm 30 weeks)

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