It's a good idea to go to the chemist they normally have people in there to help with what works and what's safe while pregnant.
Well I've used the Garnier products. Those are awesome. The hair oils are also great, they leave a shine and domt look greasy.
But on the otherhand pregnancy does cause some womens hair to become damaged and it's all because of the hormones. So idk if it'll help much putting stuff in your hair, but you can always try.