Not feeling myself, anyone else?

I'm 33 weeks pregnant and I have a scheduled c section November 30th. I was taken out of work September 16th so I have been home for about a month now. So it started three days ago, I was walking the mall with hubby and all of a sudden I felt like I was going to pass out. I literally had to hold onto him until I caught my balance and my vision was back. So yesterday and today I've felt extremely tired. Both my mom and husband told me I look super pale. I don't remember being like this with my first pregnancy. I just have my check up last week, my next one isn't for another 2 weeks. I'm trying to avoid going to the doctor if it's something that's normal. Anyone else experiencing this? Advice?