I'm 7 weeks 1 day with twins...and I can't walk around or even stand without getting really crampy and horrid back pain..I have a titled uterus so I'm assuming that what the back pain is from but my cramps really worry me they tend to go away if I sit. But as soon as i go to even walk to the bathroom start cramping again..I lost my pregnancy before my twins at 7 weeks 3 days..