Fish Oil Supplement

Mamas...do any of you take a fish oil supplement other than what's in your prenatal vitamins? My prenatal vitamins contain roughly 300 mg of fish oil with DHA and Omega 3's, but I feel like that's a little low am concerned that I should be increasing my daily intake. Keep in mind I do not eat fish. Has anyone's Doctor advised them as to how much they should be getting on a daily basis? My first appointment is not until Jan. 13th.