How do I explain to my doctor?

So a few days ago I had lifted my 2 year old daughter who weighs about 36 lbs up in my lap as I was sitting down I'm 22 weeks pregnant too. The room started to spin and I think I fainted or blacked out for a few seconds because my head unvoluntarly fell back and my eyes closed so it was like I fainted but still concious with my eyes closed if that makes sense? I don't know if I'm just doing to much or I was dehydrated and that could have caused it. I hate talking to my doctor because she always rushes me through the appointment. Is this something I should be worried about?