Is it ok to take miralax in the third trimester? I'm 38 weeks and 1 day and I can't not move my bowels for the life of me. I have taken it off and on in my 2nd trimester but jott sure if it's safe in the 3rd trimester. I called the Dr and left a VM but they close in 20 minutes and I will most likely not hear back from them till tomorrow.