Would mri without contrast find dvt? i've had back of knee and calf pain. d-dimer and ultrasound came back normal, but veins in feet&leg are bulging.

No: with these normal studies there is no reason to pursue this issue...your problem sounds like non-truncal veins

No..: The best test to reveal a DVT would be the ultrasound of the veins in your legs. The bulging veins in your legs are maybe varicose or spider veins - though you seem young for it. Sometimes, pregnancy can predispose to it however.

CT Venogram: can be done of the lower extremity to determine if clot exists if ultrasound and d dimer are negative.