A few brands do that where a supplement is separate. I had ones where the choline was a separate pill from the full prenatal. So I had to take both pills. Then I’ve taken other prenatals where you just take two identical pills to get the full amount of everything. The box or label will most likely show 1 and 1.
Don’t take anything without consulting your doctor!! They generally know your history and prescribe accordingly.
I'm not sure of that brand but I take three of my prenatal and my Naturopath has me on s Dha only for the third trimester (a different omega for the first two) plus extra methyl folate