Thanks for your query.Based on the facts that you have posted it appears that you have signs and symptoms of Pre eclampsia
with high level of serum uric acid .
You have been taking necessary medications under the supervision of your Gynaecologist .
The small crystal that you have noticed in your urine are small concretions of Uric Acid .
Please take medication like Zyluric to lower down your serum uric acid levels and consume more water .