TMI... milk of magnesia

My mom told me to drink milk of magnesia because I've been constipapted for a week and now my stomach keeps making all these weird sounds and now I have diarrhea. At 38 weeks I hope this does not make me go into labor 😭 I will be pooping everywhere this Is just horrible. Does anyone know how long it takes for it to stop working ? How long am I going to be pooping like this !?