Dizzy 26 weeks

I was braiding my hair before bed in the bathroom, and felt like I was going to pass out, I had my glucose test this morning and have tried to get enough water today, I’ve also eaten 3 meals and am on extra iron tablets but I’m also on aspirin due to my history of blot clots. I also took my progesterone pessarie about 15 minutes before this…

Is this normal at this stage? There’s been a few times I had to hold onto something coz I felt like I was gunna black out