Oh yes, totally normal at 34 weeks, your body is carrying so much more weight now and baby is really taking up space, so the tiredness and breathlessness you feel is your body just working extra hard. One thing worth knowing is that around this stage, baby tends to shift position which can actually ease the breathlessness a little, though the frequent toilet trips and heavy legs may get more noticeable. If you can, try to squeeze in short rest breaks during the day even at work, and sleep on your side rather than your back to help with circulation. It is a real trade-off, pushing through at work keeps things normal, but not resting enough can make the fatigue much worse, so see what small adjustments you can negotiate with your employer, especially since pregnancy-related leave provisions do exist if things get harder. That said, do check in with your gynae or midwife at your next appointment about the level of fatigue you are feeling, just to make sure everything looks good.