I am pregnant ❤️

So I listened to all of you and made my appointment, my baby would be too little for me to be seen. So they made my appointment to November 26. Now my questions is, I was recommended right away by the receptionist to start taking prenatal vitamins. I bought prenatal dha 200mg. Yet I researched and a lot of sites are saying to have 400mg. So how am I supposed to take them? One a day? Or 2 a day? Specific time ? This is my first pregnancy so I have so many questions and I want my baby to be healthy. Also can I still go running ?