Preeclampsia?

I have noticed the past week or so I’ve been seeing spots here and there throughout the days just randomly. I’ve tried to pay attention and see if it’s because I’m active, or if it’s when I get up too quick but it’s just random. This is my second baby and I never had this problem with my first. I hit 31 weeks yesterday and I’m wondering if maybe this could be a sign of preeclampsia? I have my appointment Friday and I plan on telling my dr about it, just wondering if anyone else has had this problem and it be preeclampsia..