Feeling faint after doing simple house work

I'm 33 weeks and today I did dishes for not even 10 mins, swept and cleaned the oven and I started to feel out of breath and dizzy, almost like I'm going to pass out. Is this normal? Anyone else feel this way? I've felt it before when it was super hot in the apartment, but it didn't come on as strong so I just thought I was over heating. I just ate a banana too, so I don't think its sugar levels.