@Chuckem15 and @Pink15 it was me talking about it. I'm a trained dietitian. If you are in good health and have no other medical conditions then the recommendations are to take folic acid to 12 weeks (to stop neural tube defects) and vitamin d (at least 10ug, but not more than 50ug) for the entire pregnancy. In fact, everyone in the UK is recommended to take vitamin d, particularly because there's been some evidence to show that a deficiency in vitamin d may increase the risk of serious complications with covid-19.
The reason we don't recommend anything else is because as long as you are eating a normal, varied diet then you should have adequate stores and dietary intake to be enough for you and the baby. Pregnancy pills are expensive and usually just end up being costly wee down the toilet (many of the vitamins are water soluble and will just go straight through you if you have enough in your diet already).
A few extra things: don't take anything with excess vitamin A, that's the one that can cause harm. Part of the reason we don't recommend folic acid past 12 weeks is because there has been some limited evidence to suggest it could raise the risk of tongue tie - but this is not confirmed and so isn't part of the official guidelines.
If you are vegetarian, vegan, or have other restrictions to your diet (or have been in the recent past) then you may need extra calcium, iron, b12 and iodine as your stores may be low, but this will be checked in your blood test and you'll be advised if you need more (in most cases, although if you are vegan you should almost definitely supplement with all of these). If your midwife recommends high dose folic acid and/or vitamin d then this will be due to other factors and should be followed - I'm just giving the very general advice here. Hope that helps!