29 weeks pregnant and feeling faint

I turned 29 weeks pregnant today and ever since I got out of the shower about 45 minutes ago I've felt like I'm gonna pass out. I'm currently sitting on my couch with water hoping it will pass, I was hoping sitting down would help the faint feeling go away but it hasn't at all. Now I'm a little worried this isn't normal and I should go to labor and delivery since my OB's office isn't open today because it's a weekend :/ has anyone else dealt with this? Do I need to be concerned? Baby is moving around and kicking so I know she's ok, I just feel so awful😥