@kMic this is from NHS pregnancy website:
Vitamin D in pregnancy
All adults, including pregnant and breastfeeding women, need 10 micrograms of vitamin D a day, and should consider taking a supplement containing this amount.
Vitamin D regulates the amount of calcium and phosphate in the body, which are needed to keep bones, teeth and muscles healthy.
Our bodies make vitamin D when our skin is exposed to summer sunlight (from late March/early April to the end of September). It's not known exactly how much time is needed in the sun to make enough vitamin D to meet the body's needs, but if you are out in the sun take care to cover up or protect your skin with sunscreen before you start to turn red or burn.
Vitamin D is also in some foods, including:
oily fish (such as salmon, mackerel, herring and sardines)
eggs
red meat
Vitamin D is added to all infant formula milk, as well as some breakfast cereals, fat spreads and non-dairy milk alternatives. The amounts added to these products can vary and might only be small.
As vitamin D is found only in a small number of foods, whether naturally or added, it might be difficult to get enough from foods alone. So everyone over the age of five years, including pregnant and breastfeeding women, should consider taking a daily supplement containing 10mcg of vitamin D.
Most people aged five years and over in the UK will probably get enough vitamin D from sunlight in the summer, so you might choose not to take a vitamin D supplement during these months.
You can get vitamin supplements containing vitamin D free of charge if you are pregnant or breastfeeding and qualify for the Healthy Start scheme.