Yolly, yes it's perfectly possible to faint due to low blood sugar, pregnant or not.

It's a good idea to base your diet around low-GI carbohydrates, make sure you're eating a couple of serves of slow-burning carb and a bit of protein at each meal and don't neglect to have snacks (and drinks) in between. It could be you're just not eating enough!

Not long to go now - good luck with it all!