First day I had 2 contractions one after another. SeCond day I had 8 contractions one right after the other. 3rd day I had back pain all day then at night started feeling some pressure with the back pain and small contracting in belly that lasted about an hour. Today is 4th day and still having back pain not contracting but feeling discomfort on low abdomen. Im 30 weeks today. What could this be? Should I be concerned? ?