I'd add some magnesium citrate for the constipation issue!
Please do your research on whether the herbs are contra-indicated for pregnancy.
Using wild harvested horse chestnut is supposed to be toxic, so it's best to get a standardized supplement of that one in particular (if memory serves). I've had vein problems too in pregnancy, and I've taken a product called 'leg viens' this time with excellent results...no pain or vein problems to report this time around, and I'm at 32 weeks!
If you start having swelling/rashes, or issues that would indicate liver stress (usually first or third trimester as the body is flushing hormones out too quickly), then dandelion is a great one to add in.
I agree in theory about using whole herbs instead of supplements, but I have an aversion to bad tastes
, so I usually just do caps instead of teas/smoothies.