Hi, yes they sound like they could be varicose veins. I had them every pregnancy and they suck lol. Common in pregnancy, something to do with the pregnancy hormones relaxing everything, including the one way valves in the veins so they pool up with blood and bulge (or something along those lines lol) that added with the extra weight and pressure round your pelvis puts more pressure on them so they tend to get worse as you get further along.
Pressure stockings definitely help, you are meant to put them on after you have been lying with your legs elevated for a while, & they are quite hard to put on as they are so tight (& even harder when you are hugely pregnant) so might need some help to get them on. But they do help in terms of making you feel alot more comfortable, especially when they start throbbing and stinging as soon as you stand up and they start to pool. You can buy them from chemists and also online, quite expensive (I think around $80 roughly) not sure exactly my mum bought me mine.
The things we go through hey lol