Varicose vain

Jessica
So I have a really bad vain on my left leg. It's been really bothering me for the last 3 days. It's swollen up and it hurts to walk, bend my knee and even streight en my leg. It's right behind my knee. It's pretty blue and popping out of my skin. Is this something I need to let my doctor know asap? I'm almost 24 weeks