hi jenn, crystals in urine analysis may form if urine is kept for a while before testing it. so not much importance should be given to it. check if there are pus cells or red cells in your urine, these are more likely to suggest infection or urinary stones. Back ache is often part of pregnancy
. But it can also be due to urine infection or stones. I suggest you consult your obstetrician for concerns regarding low weight gain. You should also see a urologist
, who might suggest blood tests, blood sugar levels and a sonography
swelling can occur even in normal pregnancy due to pressure by the growing baby. So in case of doubt, sometimes an MRI
may help. Take lots of water and citrus juices. get urine tested regularly, check your blood pressure. take care.