baby boa hasnt gone to the bathroom in a month

I just got my Colombian redtail boa on January 2 or 4th I cant remember which lol. I'm not sure how old she is, but I am guessing about 2 months, she is pretty tiny. She eats very well, only refused a meal once when she was in shed after blue, and drinks her water. She is active, and tame as can be. She urinated about a day after I got her, and hasnt urinated ( no urates either) or defecated for a month now. I have soaked her in "warm" water twice now since reading on here that that is a good way to help ease things. Her vent doesn't seem too swollen, maybe a bit though. How much longer should I wait before I should start to really worry and consult a vet?

Thanks

How often are you feeding your boa? And lastly what are you feeding your boa? rat or mice hopper