You really need to run this (do's and don'ts) past your OB for he/she is the only one who can properly advise you in this instance.
Here is a link regarding collection 24 hour urine:
http://www.webmd.com/a-to-z-guides/c...earance?page=2
http://www.mercksource.com/pp/us/cns...Sz003622zPzhtm
Good luck with your pregnancy. We wish you well.