Working out

So my hubby and I joined a gym together this past month. He works out religiously and it is very important to him. I work out but do get into lazy spells but would categorize myself as someone who works out 3 times a weeks atleast. Since going to this new gym, which is a crossfit gym, I have had to be pretty aware of how I'm feeling and adjust my pace based on that. So the last two workouts I have been feeling pretty weak. Yesterday I felt like just crying because of frustration. I know I am pregnant (10 weeks) but I dislike feeling off in the gym. Yesterday we had a work out that was tough for everyone.. after running a half mile.. I felt done... I took many breaks and only got through half the workout. I am pretty self-conscious, so watching everyone else zoom on by was difficult.. I knew being pregnant would make me slow down but I guess sometimes I feel like I am just weak and want to give up!