work & pregnancy

currently 26 weeks and will be going into my third trimester in less than a week. i work at a nursing home and got mandated for the night so i’m working a 16 hour shift. 3pm - 7am and then i’m scheduled to work the following day 3-11pm. i’m just wondering if thats safe to even be doing. i’m not use to staying up all night and my body is so tired and ill only get to sleep 4 hours by the time i get home then have to come back in. could i get in trouble for calling off for the following day or would my obgyn tell me i shouldn’t be working like that?