exercise advice?!

Valerie
Does anyone have any tips on how they force themselves to exercise at the end of the work day when the first trimester symptoms are in full swing? 
Exercise was a huge part of my life prior to this pregnancy and I always made time for it. I'm almost 10 weeks now and my exercise days have dwindled from 4 to 2 days per week. I'm just so tired and queasy and my self-control feels shot. I usually end up convincing myself that sleep is more important when I feel this way.