Cramping and Lower Back Aches

So I'm 5 weeks 5 days and I'm still having cramping on and off almost everyday. It's worse at night when I'm asleep. I know it's supposed to be normal. I more concerned because I had a miscarriage around my 8th week in August 2015. My first pregnancy I had cramps and back aches but it was only for about 2 weeks. Anyone else experiencing this and are around the same week as I am?