Liquid Chlorophyll brand/dosage recommendations?

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*I hope this is the right forum*

I think I need to start taking some liquid chlorophyll.  I'm pregnant and in need of iron and general nutrition after 3 months of puking and eating hardly anything.  When I look into liquid chlorophyll I see a huge range of prices, brands and dosing instructions.  I'm tempted to just go with the NOW brand only because it's one I recognize. 

1. Can anyone recommend a partucularly reputable brand?

2. If you take it, how much do you take?

3. Would that dose be safe for pregnancy?

TIA!

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oops.