juggling full time and pregnant

Are there any ladies out there juggling a full time job (45-50hrs and sometimes more) and pregnant?? How are you dealing with the fatigue and exhaustion?? I used to go to work, go to the gym and come home and make dinner. Now it's a struggle just to get through the work day. Being the manager at my job I have a whole team depending on me and I just don't have the energy. Is anyone else with me on this?? Do you take some time off to recharge or just keep pushing through (what I've been doing cause I don't want to seem incapable of doing my job).