If i took one hit of medicinal marihuana, and i'm 25 weeks pregnant, how long will it take to get out of my system and my unborn babies system?

Define "out": Your baby starts making meconium after 12 weeks and that will store evidence of any drug exposure for months if not the whole pregnancy. If you stay off the radar of CFS there would be little chance anyone would look for this, but if you continue or end up on their list, the area hospitals would routinely do both urine and meconium testing.

What does "out of my: system" and "baby's system" mean to you. In terms of getting any appreciable or even detectable THC levels after a single "hit" it may be detectable for 24-48 hours at most, and its acute effects on either you or your baby will only last for a few hours. However, it will stay in baby's stool (meconium) through birth. Stay away from ANY unnecessary drugs, prescribed or no, in pregnancy!

Under 30 days: A small amount should have minimal issues, and certainly will be undetectable over a few weeks, but best to avoid all such items during pregnancy.